Select all features that first appear between three and four months of human development.
a. fingernails
b. nipples
c. male or female gonads
d. All of the above
Ans: d. All of the above
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Anaphase
a. involves the lining up of the chromosomes across the equatorial plate. b. is the same in mitosis and meiosis I and II. c. is initiated when the newly divided centromeres begin to move apart. d. results in an unequal distribution of chromosomes to the resulting cells. e. does not occur in meiosis II.
The excretory system of insects:a
has many openings on the body wall. b. contains flame cells. c. is not connected to the gut. d. excretes uric acid from the rectum. e. relies on diffusion across the body wall.
Hamilton's Rule reveals that the more closely related two individuals are:
a) the less likely they will be to mate with each other. b) the more likely their inclusive fitness will be reduced via cooperation. c) the more likely they will disperse from each other at maturity. d) the more likely they will be competing for the same limited resources. e) the more likely they are to act altruistically towards each other.
Describe the characteristics of the Phylum Platyhelminthes. Check all that apply.
A. They exchange respiratory gases through the body wall. B. They have a complete digestive system. C. They are acoelomate. D. They are triploblastic.