Why may it have been an evolutionary advantage for cephalopods to have a highly reduced shell or none at all?
What will be an ideal response?
Shell loss may have been driven by competition with jawed fishes, which evolved 400 million years ago. Cephalopods with the smallest shell could be fastest and most agile.
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The concept of a molecular clock allows a population geneticist to estimate what?
A. how quickly mutations are occurring in all species B. how long two populations of the same species have been separated C. how frequently beneficial mutations will appear in a population D. how large a population is
HeLa’s cells were critical in
a. the development of polio vaccines. b. developing a cure for malaria. c. understanding fertilization. d. the development of a cervical vaccine. e. more than one of these
The walls of fungi contain
a. cellulose. b. lignin. c. chitin. d. pectin. e. protein
The first cells were ____
anaerobic a. autotrophic b. parasitic c. anaerobic d. aerobic e. necrotic