During fetal development, when is it possible to clearly distinguish a male from a female?
Answer: during the 3rd month
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A species' fundamental niche:
A. is smaller than its realized niche. B. is what is actually occupied by that species. C. is determined by competition between species. D. has the necessary resources and conditions for survival. E. is always occupied in full by most species.
A sea squirt uses its ____ for food collection and gas exchange
a. siphon b. pharynx c. tunic d. mantle e. radula
What event enabled the rats to become
resistant to warfarin?
a. mutation of a gene associated with the recycling of vitamin A b. mutation of a gene associated with vitamin K c. mutation of a gene associated with blood clotting d. mutation of a gene associated with blood production e. more than one of these enabled rats to become resistant to warfarin
Conjugating ciliates exchange a pair of haploid micronuclei that undergo mitosis as a diploid micronucleus, while the macronucleus in each
A. divides by meiosis. B. is expelled from the cell. C. fuses with each other. D. shrinks and becomes diploid micronuclei. E. disintegrates.