The breathing center in the brain is most sensitive to the
a. concentration of oxygen
b. concentration of carbon dixoide in the lungs
c. concentration of carbon dioxide in the blood
d. amount of oxygen in the cells
Ans: c. concentration of carbon dioxide in the blood
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What is considered to be the primary method of succession in the marine intertidal zone?
A. facilitation. B. submission. C. logistic growth. D. tolerance. E. inhibition.
A gamete having more than one complete set of paired chromosomes
A. is polyploid. B. will undergo mitosis. C. cannot be produced by meiosis. D. is not yet through meiosis. E. cannot participate in fertilization.
Glandular root-hairs of tomato plants secrete
aromatic chemicals to deter plant eating insects. What do these structures secrete from the cannabis plant? a. THC b. hydrogen peroxide c. latex d. phloem fluid e. sharp edged crystals
The first part of the seedling to come out during germination is:
a. plumule. b. radicle. c. cotyledons. d. leaves. e. coleoptile.