Over 380,000 species of angiosperms exist on Earth. Which of the following factors contributed to this diversity of flowering plants? Select all correct choices
A. pollination by different insects
B. infections by different bacteria
C. predation by different herbivores
D. infections by different fungi
A,B,C,D
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How do protists provide evidence for the step-wise evolution of mitosis?
A. In some protists the nuclear membrane fails to breakdown during mitosis. B. Protists use conjugation instead of mitosis. C. Only meiosis occurs in protists. D. Mitosis has not been observed in any protist species.
Why do Siamese cats have brown ears, nose, tails and paws?
a. Siamese cats contain heat sensitive enzymes that are more active in the extremities. b. Siamese cats contain heat sensitive enzymes that are more active in the core body. c. Siamese cats contain pH sensitive enzymes that are more active in regions of the body exposed to UV radiation. d. Siamese cats contain pH sensitive enzymes that are more active in regions of the body that are not exposed to UV radiation e. Siamese cats contain pH sensitive enzymes that are more active in regions of the body that contain nerve endings.
Starch and cellulose can provide animals with energy only if they are first broken down into ________molecules
a. water b. glucose c. sucrose d. carbon dioxide e. amino acids
Which of the following is(are) specialization(s)
that evolved in land plants that was(were) unnecessary in their aquatic ancestors? a. xylem b. phloem c. stomata d. roots e. all of these