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Buy from Amazon $1,060$0.01 $900.00 $675.00 $450.00 $225.00 Dec Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $25.54, Sep 11 5:18 am$24.37, Nov 17 8:36 pm$24.29, Nov 23 - Nov 25$24.39, Nov 27 - Dec 10$23.71, Dec 12 4:07 am$23.80, Dec 14 - Dec 16$23.49, Dec 18 - Dec 21$23.48, Dec 23 10:19 pm$23.49, Dec 26 - Jan 8$23.86, Jan 9 - Jan 12$24.38, Jan 12 - Jan 14$23.85, Jan 15 - Jan 27$24.28, Jan 28 - Feb 14$24.30, Feb 15 - Feb 17$25.12, Feb 17 - Mar 3$25.65, Mar 4 - Mar 6$24.99, Mar 7 - Mar 26$25.37, Mar 27 - Apr 25$25.27, Apr 25 - May 1$25.22, May 3 - May 11$25.22, May 2 - May 11$12.78, May 3 4:37 am$25.22, May 3 - May 11$25.22, May 2 - May 11$12.74, May 5 2:57 pm$25.22, May 3 - May 11$25.22, May 2 - May 11$12.69, May 8 12:28 am$25.22, May 3 - May 11$25.22, May 2 - May 11$12.65, May 10 7:29 am$25.34, May 12 - May 15$25.34, May 12 - May 15$12.49, May 12 - May 13$25.34, May 12 - May 15$25.34, May 12 - May 15$12.43, May 15 4:04 pm$24.99, May 17 - May 22$24.99, May 17 - May 22$12.41, May 17 10:44 am$24.99, May 17 - May 22$24.99, May 17 - May 22$12.36, May 20 8:23 am$24.99, May 17 - May 22$24.99, May 17 - May 22$12.31, May 22 - May 23$24.74, May 23 - Jun 5$24.74, May 23 - Jun 5$12.21, May 25 8:43 am$24.74, May 23 - Jun 5$24.74, May 23 - Jun 5$11.97, May 27 8:32 pm$24.74, May 23 - Jun 5$24.74, May 23 - Jun 5$11.65, May 29 9:19 pm$24.74, May 23 - Jun 5$24.74, May 23 - Jun 5$9.76, Jun 1 12:15 pm$24.74, May 23 - Jun 5$24.74, May 23 - Jun 5$8.03, Jun 4 12:02 am$24.74, May 23 - Jun 5$24.74, May 23 - Jun 5$7.29, Jun 5 5:25 pm$24.36, Jun 7 - Jun 19$24.36, Jun 7 - Jun 19$7.24, Jun 8 5:49 pm$24.36, Jun 7 - Jun 19$24.36, Jun 7 - Jun 19$7.18, Jun 11 1:42 pm$24.36, Jun 7 - Jun 19$24.36, Jun 7 - Jun 19$7.12, Jun 13 8:55 pm$24.36, Jun 7 - Jun 19$24.36, Jun 7 - Jun 19$7.06, Jun 16 2:01 am$24.36, Jun 7 - Jun 19$24.36, Jun 7 - Jun 19$6.97, Jun 18 8:47 am$24.51, Jun 20 - Jun 26$24.51, Jun 20 - Jun 26$6.86, Jun 21 9:57 am$24.51, Jun 20 - Jun 26$24.51, Jun 20 - Jun 26$6.78, Jun 22 - Jun 23$24.51, Jun 20 - Jun 26$24.51, Jun 20 - Jun 26$6.68, Jun 26 12:07 am$24.41, Jun 26 - Jul 9$24.41, Jun 26 - Jul 9$6.59, Jun 28 8:09 am$24.41, Jun 26 - Jul 9$24.41, Jun 26 - Jul 9$6.45, Jun 30 4:27 pm$24.41, Jun 26 - Jul 9$24.41, Jun 26 - Jul 9$6.39, Jul 3 1:46 am$24.41, Jun 26 - Jul 9$24.41, Jun 26 - Jul 9$6.27, Jul 5 9:38 am$24.41, Jun 26 - Jul 9$24.41, Jun 26 - Jul 9$6.14, Jul 7 10:42 pm$24.26, Jul 10 - Jul 16$24.26, Jul 10 - Jul 16$6.02, Jul 10 9:39 am$24.26, Jul 10 - Jul 16$24.26, Jul 10 - Jul 16$5.89, Jul 12 8:11 pm$24.26, Jul 10 - Jul 16$24.26, Jul 10 - Jul 16$5.77, Jul 15 7:03 am$24.23, Jul 18 - Jul 20$24.23, Jul 18 - Jul 20$10.77, Jul 18 3:19 am$24.23, Jul 18 - Jul 20$24.23, Jul 18 - Jul 20$11.74, Jul 20 - Jul 23$24.26, Jul 21 - Jul 24$24.26, Jul 21 - Jul 24$11.74, Jul 20 - Jul 23$92.43, Jul 25 10:27 am$24.26, Jul 21 - Jul 24$21.54, Jul 25 - Aug 2$83.78, Jul 28 3:11 am$24.26, Jul 21 - Jul 24$21.54, Jul 25 - Aug 2$80.80, Jul 29 10:05 pm$24.26, Jul 21 - Jul 24$21.54, Jul 25 - Aug 2$79.11, Aug 1 2:26 pm$24.26, Jul 21 - Jul 24$21.54, Jul 25 - Aug 2$77.27, Aug 4 - Aug 9$24.95, Aug 4 - Aug 11$24.26, Jul 21 - Jul 24$24.95, Aug 4 - Aug 11$24.60, Aug 11 - Aug 14$24.60, Aug 11 - Aug 14$27.14, Aug 16 4:20 am$24.60, Aug 11 - Aug 14$24.60, Aug 11 - Aug 14$27.15, Aug 17 - Aug 18$24.41, Aug 17 8:32 am$24.41, Aug 17 8:32 am$27.14, Aug 21 - Aug 29$24.41, Aug 17 8:32 am$24.41, Aug 17 8:32 am$97.32, Aug 25 7:25 pm$27.14, Aug 21 - Aug 29$24.41, Aug 17 8:32 am$97.08, Aug 28 - Aug 29$27.14, Aug 21 - Aug 29$24.41, Aug 17 8:32 am$62.43, Aug 30 - Aug 31$41.44, Aug 30 - Sep 1$24.41, Aug 17 8:32 am$155.29, Sep 1 - Sep 4$97.75, Sep 2 9:21 pm$24.41, Aug 17 8:32 am$154.95, Sep 5 6:33 am$41.84, Sep 4 - Sep 30$24.41, Aug 17 8:32 am$155.29, Sep 7 3:07 pm$41.84, Sep 4 - Sep 30$24.41, Aug 17 8:32 am$154.79, Sep 10 12:57 am$41.84, Sep 4 - Sep 30$24.41, Aug 17 8:32 am$155.29, Sep 12 - Sep 17$41.84, Sep 4 - Sep 30$24.41, Aug 17 8:32 am$260.36, Sep 19 9:36 pm$41.84, Sep 4 - Sep 30$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$41.84, Sep 4 - Sep 30$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$38.51, Oct 4 9:03 pm$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$36.28, Oct 6 10:40 pm$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$34.33, Oct 9 12:52 am$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$31.66, Oct 11 2:27 am$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$29.65, Oct 13 5:33 am$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$28.52, Oct 15 7:43 am$24.41, Aug 17 8:32 am$823.10, Sep 26 - Sep 30$27.95, Oct 17 - Oct 24$24.41, Aug 17 8:32 am$1,060, Oct 30 4:43 am$27.23, Oct 30 4:43 am$24.41, Aug 17 8:32 am$1,059, Nov 4 5:47 pm$25.97, Nov 4 5:47 pm$24.41, Aug 17 8:32 am$1,058, Nov 11 5:55 am$24.41, Aug 17 8:32 am$23.58, Nov 11 5:55 am$1,057, Nov 16 6:47 am$24.41, Aug 17 8:32 am$23.14, Nov 16 6:47 am$1,057, Nov 19 9:11 am$24.41, Aug 17 8:32 am$22.89, Nov 19 9:11 am$24.41, Aug 17 8:32 am$22.72, Nov 21 10:52 am$20.00, Nov 21 - Jan 12$24.41, Aug 17 8:32 am$22.58, Nov 23 11:23 am$20.00, Nov 21 - Jan 12$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$10.55, Nov 27 12:18 pm$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$10.46, Nov 29 10:45 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$10.31, Dec 1 9:33 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$10.01, Dec 5 5:40 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$9.92, Dec 7 3:37 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$9.77, Dec 9 5:13 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$9.64, Dec 11 7:56 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$9.52, Dec 13 7:13 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$9.24, Dec 17 4:53 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$8.88, Dec 21 11:27 pm$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$8.75, Dec 24 3:46 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$8.56, Dec 26 5:11 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$8.19, Dec 29 2:42 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$7.99, Dec 30 6:42 pm$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$7.80, Jan 1 10:27 am$24.41, Aug 17 8:32 am$20.00, Nov 21 - Jan 12$6.67, Jan 12 10:06 am$59.51, Jan 15 3:42 pm$24.41, Aug 17 8:32 am$5.49, Jan 15 3:42 pm$58.40, Jan 17 6:59 am$24.41, Aug 17 8:32 am$4.99, Jan 17 6:59 am$56.59, Jan 20 12:36 pm$24.41, Aug 17 8:32 am$2.89, Jan 20 12:36 pm$54.66, Jan 22 3:47 am$24.41, Aug 17 8:32 am$2.38, Jan 22 3:47 am$52.29, Jan 24 1:49 pm$24.41, Aug 17 8:32 am$2.26, Jan 24 1:49 pm$50.03, Jan 27 11:50 pm$24.41, Aug 17 8:32 am$2.08, Jan 27 11:50 pm$49.59, Jan 29 3:18 pm$24.41, Aug 17 8:32 am$1.93, Jan 29 3:18 pm$47.85, Jan 31 9:58 am$24.41, Aug 17 8:32 am$1.87, Jan 31 9:58 am$45.23, Feb 4 1:16 am$24.41, Aug 17 8:32 am$1.75, Feb 4 1:16 am$44.33, Feb 5 6:58 pm$24.41, Aug 17 8:32 am$1.69, Feb 5 6:58 pm$43.00, Feb 9 8:58 am$24.41, Aug 17 8:32 am$1.57, Feb 9 8:58 am$42.55, Feb 11 4:30 am$24.41, Aug 17 8:32 am$1.35, Feb 11 4:30 am$41.88, Feb 13 12:14 am$24.41, Aug 17 8:32 am$1.21, Feb 13 12:14 am$40.85, Feb 16 5:56 pm$24.41, Aug 17 8:32 am$0.71, Feb 16 5:56 pm$40.55, Feb 18 3:33 pm$24.41, Aug 17 8:32 am$0.65, Feb 18 3:33 pm$40.22, Feb 20 12:51 pm$24.41, Aug 17 8:32 am$0.56, Feb 20 12:51 pm$28.74, Feb 23 - Mar 8$27.52, Feb 23 11:10 am$0.43, Feb 23 11:10 am$28.74, Feb 23 - Mar 8$24.39, Feb 25 8:53 am$0.35, Feb 25 8:53 am$28.74, Feb 23 - Mar 8$24.06, Feb 27 7:07 am$0.29, Feb 27 7:07 am$28.74, Feb 23 - Mar 8$23.77, Mar 1 5:11 am$0.25, Mar 1 5:11 am$28.74, Feb 23 - Mar 8$24.74, Mar 3 - Mar 4$0.15, Mar 4 1:02 pm$28.74, Feb 23 - Mar 8$24.41, Mar 6 1:17 pm$0.08, Mar 6 1:17 pm$25.02, Mar 10 7:06 pm$21.02, Mar 10 7:06 pm$0.01, Mar 10 - Apr 23$24.60, Mar 13 - Mar 15$20.60, Mar 13 - Mar 15$0.01, Mar 10 - Apr 23$24.57, Mar 17 9:20 pm$20.57, Mar 17 9:20 pm$0.01, Mar 10 - Apr 23$31.93, Mar 20 - Mar 22$27.72, Mar 20 5:05 am$0.01, Mar 10 - Apr 23$31.93, Mar 20 - Mar 22$27.91, Mar 22 2:37 pm$0.01, Mar 10 - Apr 23$27.85, Mar 24 10:36 pm$0.01, Mar 10 - Apr 23$27.43, Mar 27 5:44 am$0.01, Mar 10 - Apr 23$27.22, Mar 28 10:12 am$0.01, Mar 10 - Apr 23$26.53, Mar 30 6:55 pm$0.01, Mar 10 - Apr 23$25.93, Apr 2 7:58 am$0.01, Mar 10 - Apr 23$42.03, Apr 4 10:17 pm$0.01, Mar 10 - Apr 23$41.59, Apr 7 2:12 pm$0.01, Mar 10 - Apr 23$41.29, Apr 10 6:46 am$0.01, Mar 10 - Apr 23$52.57, Apr 13 3:16 am$0.01, Mar 10 - Apr 23$64.75, Apr 15 11:04 pm$0.01, Mar 10 - Apr 23$62.41, Apr 18 11:38 am$0.01, Mar 10 - Apr 23$57.47, Apr 21 4:20 am$0.01, Mar 10 - Apr 23$52.89, Apr 23 10:47 pm$0.01, Mar 10 - Apr 23$48.69, Apr 27 2:38 am$0.01, Apr 27 - Jun 12$45.25, Apr 29 11:48 pm$0.01, Apr 27 - Jun 12$40.65, May 2 4:44 pm$0.01, Apr 27 - Jun 12$38.24, May 5 8:58 am$0.01, Apr 27 - Jun 12$36.31, May 9 6:14 am$0.01, Apr 27 - Jun 12$33.71, May 12 10:47 am$0.01, Apr 27 - Jun 12$40.99, May 15 8:03 pm$0.01, Apr 27 - Jun 12$38.17, May 20 2:26 am$0.01, Apr 27 - Jun 12$35.99, May 24 5:16 am$0.01, Apr 27 - Jun 12$34.23, May 28 1:11 pm$0.01, Apr 27 - Jun 12$33.59, May 30 9:10 pm$0.01, Apr 27 - Jun 12$99.38, Jun 4 - Jun 8$0.01, Apr 27 - Jun 12$99.00, Jun 12 - Jun 16$0.01, Apr 27 - Jun 12$99.00, Jun 12 - Jun 16$2.91, Jun 16 1:06 pm$110.44, Jun 20 8:10 am$2.83, Jun 20 8:10 am$110.32, Jun 22 6:04 am$2.82, Jun 22 6:04 am$110.28, Jun 26 - Jun 30$2.80, Jun 26 1:35 am$110.28, Jun 26 - Jun 30$2.79, Jun 30 2:49 am$110.26, Jul 4 8:09 am$2.77, Jul 4 8:09 am$88.36, Jul 9 10:08 pm$2.99, Jul 9 10:08 pm$88.68, Jul 14 1:28 am$2.77, Jul 14 1:28 am$86.07, Jul 17 5:08 pm$2.74, Jul 17 5:08 pm$91.70, Jul 21 8:49 am$2.71, Jul 21 8:49 am$103.26, Jul 24 10:52 pm$2.65, Jul 24 10:52 pm$103.24, Jul 28 11:42 am$2.57, Jul 28 11:42 am$102.62, Aug 1 - Aug 4$2.49, Aug 1 1:59 am$102.62, Aug 1 - Aug 4$2.43, Aug 4 3:57 pm$95.78, Aug 8 - Aug 15$2.36, Aug 8 9:20 am$95.78, Aug 8 - Aug 15$2.30, Aug 12 4:22 am$95.78, Aug 8 - Aug 15$2.47, Aug 15 9:46 pm$95.74, Aug 19 - Aug 23$2.32, Aug 19 4:02 pm$95.74, Aug 19 - Aug 23$2.22, Aug 23 9:37 am$95.72, Aug 27 4:41 am$2.11, Aug 27 4:41 am$89.46, Aug 30 10:14 pm$1.73, Aug 30 10:14 pm$89.42, Sep 3 6:30 pm$1.54, Sep 3 6:30 pm$89.40, Sep 7 4:10 pm$1.33, Sep 7 4:10 pm$89.38, Sep 11 1:12 pm$1.29, Sep 11 1:12 pm$83.68, Sep 15 10:10 am$1.22, Sep 15 - Sep 19$86.68, Sep 19 7:15 am$1.22, Sep 15 - Sep 19$74.84, Sep 23 5:14 am$1.16, Sep 23 5:14 am$71.96, Sep 27 3:07 am$0.87, Sep 27 3:07 am$74.76, Oct 1 2:36 am$0.01, Oct 1 - Mar 31$68.46, Oct 5 4:27 am$0.01, Oct 1 - Mar 31$38.00, Oct 9 8:06 am$0.01, Oct 1 - Mar 31$66.02, Oct 13 7:53 am$0.01, Oct 1 - Mar 31$69.02, Oct 17 5:33 am$0.01, Oct 1 - Mar 31$66.44, Oct 21 3:14 am$0.01, Oct 1 - Mar 31$66.02, Oct 24 11:16 pm$0.01, Oct 1 - Mar 31$65.20, Oct 28 - Nov 14$0.01, Oct 1 - Mar 31$65.49, Nov 18 1:18 pm$0.01, Oct 1 - Mar 31$62.92, Nov 22 10:51 pm$0.01, Oct 1 - Mar 31$61.68, Nov 27 11:41 am$0.01, Oct 1 - Mar 31$61.32, Dec 2 8:33 am$0.01, Oct 1 - Mar 31$60.50, Dec 7 5:51 am$0.01, Oct 1 - Mar 31$61.92, Dec 9 - Dec 19$0.01, Oct 1 - Mar 31$66.60, Dec 24 - Dec 29$0.01, Oct 1 - Mar 31$60.70, Jan 3 - Jan 8$0.01, Oct 1 - Mar 31$62.26, Jan 13 - Jan 18$0.01, Oct 1 - Mar 31$108.52, Jan 23 - Jan 31$0.01, Oct 1 - Mar 31$112.02, Feb 5 3:27 am$0.01, Oct 1 - Mar 31$69.50, Feb 10 5:12 am$0.01, Oct 1 - Mar 31$67.76, Feb 15 1:53 pm$0.01, Oct 1 - Mar 31$79.88, Feb 20 10:51 pm$0.01, Oct 1 - Mar 31$78.84, Feb 26 9:41 am$0.01, Oct 1 - Mar 31$86.98, Mar 8 - Mar 19$0.01, Oct 1 - Mar 31$84.38, Mar 31 5:45 am$0.01, Oct 1 - Mar 31 78,5801,749,405 1,953,125 1,562,500 1,171,875 781,250 390,625 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr 2015 2016

Price Details

New

Last Seen $31.93 Mar 22, '15
Highest $31.93 Mar 20, '15
Lowest $23.48 Dec 23, '13
Average $24.79 (Overall average)
Added Sep 11, 2013

3rd Party New

Last Seen $84.38 Mar 31, '16
Highest $1,060 Oct 30, '14
Lowest $20.00 Nov 21, '14
Average $86.98 (30d avg)
$82.08 (90d avg)
$72.61 (180d avg)
$74.91 (365d avg)
$131.00 (Lifetime average)
Added Sep 11, 2013

3rd Party Used

Last Seen $0.01 Mar 31, '16
Highest $97.75 Sep 2, '14
Lowest $0.01 Oct 1, '15
Average $0.01 (30d avg)
$0.01 (90d avg)
$0.01 (180d avg)
$0.66 (365d avg)
$7.82 (Lifetime average)
Added Sep 11, 2013

Sales Rank

30 day average: 1,276,784
90 day average: 1,112,246

Product Description

Explains photosynthesis, the process responsible for providing the material and energy for all living things, and discusses such related issues as respiration, the carbon cycle, acid rain, and the greenhouse effect.

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