Each year, plants and algae remove approximately ________ of the CO2 in the atmosphere.
A. half
B. 1/7th
C. 1/50th
D. 100%
Answer: B
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Describe how mutations can lead to whole populations of bacteria becoming resistant to certain antibiotics
What will be an ideal response?
Any substance that forms between the beginning and end of a metabolic pathway is a(n)
a. reactant. b. end product. c. substrate. d. intermediate. e. chemical.
There is no change in population size when the instantaneous per capita rate of growth (r) is equal to ________
Fill in the blank(s) with correct word
What happens during countercurrent exchange in fishes?
A) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface. B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface. C) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport. D) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion. E) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.