Select the characteristics that is found in all chordates at some time in life.
a. notochord
b. postanal tail
c. pharyngeal gill slits
d. all of these
Answer: d. all of these
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In the genotype Aabb,
A. A is a dominant allele. B. a and b are alleles of each other. C. A and b are at the same locus. D. A and a are dominant genes.
Cyanide blocks the utilization of oxygen at the cellular level by:
A) binding to monoamine oxidase. B) directly destroying red blood cells. C) binding to the hemoglobin molecule. D) combining with cytochrome oxidase.
Blue-footed boobies of the Galapagos will mate only after a very specific courtship display on the part of the male. He high-steps to advertise his bright blue feet. What isolating mechanism discourages mating outside the species?
A) gametic isolation B) temporal isolation C) ecological isolation D) behavioral isolation
The figure below illustrates that 
A. most animal species have eyes with one photoreceptor and one pigment cell. B. the retina and cornea developed first, but then were secondarily lost in insects such as Drosphilia. C. genetic changes in an ancestral Pax6 gene contributed to the evolution of the mammal eye, while the Drosphilia eye arose independently. D. eye complexity has not significantly increased since the late Triassic when most modern insect families arose. E. although the mammal eye possesses more cell types and greater complexity than the Drosphilia eye, both arose from genetic changes to an ancestral Pax6 gene.