What are the two most important nutrients affecting production in aquatic ecosystems?
A. oxygen and hydrogen
B. carbon and oxygen
C. carbon and iron
D. nitrogen and phosphorus
E. carbon and calcium
D. nitrogen and phosphorus
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Products of the Calvin cycle include: Check all that apply.
_____ NADP+ _____ Pi _____ ADP _____ glyceraldehyde-3-phosphate (G3P) _____ NADPH
Lymph moves throughout the lymph vessels due to ____
a. contraction of the heart b. conscious actions c. constriction of blood vessels d. dilation of blood vessels e. skeletal muscle and breathing movements
About how many million years ago did humans of the genus Homo first inhabit eastern Africa?
a. 2 b. 4 c. 6 d. 8 e. 10
Animal cells typically achieve cytokinesis by
A. forming a cleavage furrow that pinches the cell into two. B. forming a cell plate across the middle of the cell. C. binary fission. D. chromosome condensation. E. chromosome elongation.