The above figure represents
a. petunia eggs.
b. pine pollen.
c. pansy spores.
d. petal fragments.
e. poppy seeds.
Answer: b
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Which of the following is a sulfide?
A) H2S B) HS- C) S2- D) H2S, HS-, and S2- are all sulfides.
Which of the following characteristics distinguishes birds from reptiles?
a. Reptiles have only one single middle ear bone, while birds have two or more. b. The shape of their occipital condyles allows birds to rotate their heads more than reptiles can. c. Birds are endothermic. d. Birds and reptiles have distinctly different jaw bone morphologies.
An evolutionary model of animal development explains how _____.
A. animal body plans are constrained by existing structures in ancestral organisms. B. homeotic genes are not universal among animals. C. homeotic genes are found only in fruit flies, where they are responsible for odd placement of appendages. D. new genetic lines are produced less by modification than by unique mutation. E. somites form as blocks of genes in cells randomly distributed throughout the body.
If adaptation occurred, genotypes remaining at the end of the experiment should have had more rigid enzymes than their ancestors had.
a. true b. false