In which ponds did male guppies have the lowest mean number of spots?
a. ponds with no predators
b. ponds with cichlids only
c. ponds with killifish only
d. ponds with cichlids and killifish
b
You might also like to view...
A variety of finch species within the Hawaiian Islands have acquired different types of beaks needed for utilizing specific food resources. The process by which these different species of finches came about is likely to have involved
A. natural selection. B. evolution. C. an accumulation of harmful genetic mutations. D. both natural selection and evolution. E. None of these choices are correct.
The size of a plant's seeds reflects an evolutionary trade-off. Large, heavy seeds contain ample nutrients to fuel seedling growth but may not travel far. In contrast, small seeds store limited nutrients but disperse far and wide. Human-cultivated crops typically have larger seeds than do their wild ancestors. How has human farming altered the evolution of these crops?
A. We grow the plants under conditions that favor the growth of larger seeds. B. By using fertilizers, the seeds do not need to store as many nutrients. C. We have created crop plants that are more competitive in the wild than their ancestors. D. Because we spread the seeds, we can spread more smaller seeds per acre, thus favoring these plants. E. We have removed the selection pressure favoring small seed size.
Charles Darwin
a. lived in New England.. b. studied to become a doctor. c. followed his avocation as a sailor. d. is identified with the concept of natural selection. e. sailed on the H.M.S. Bassett.
Which of the following bacterial infections CANNOT be transmitted by dog or cat bites?
A) Pasteurella multocida B) Streptobacillus C) Bartonella henselae D) Fusobacterium E) None of the answers is correct; all of these bacterial infections can be transmitted by dog or cat bites.