Mutations and polymorphisms are both changes in a dna sequence, but polymorphisms are more common becausea. they less severely affect the phenotype, so that individuals can reproduce and transmit them. b. more people have them. c. mutations are always lethal. d. they more severely affect the phenotype, so that individuals cannot reproduce and transmit them. e. mutations refer to a real situation, whereas a polymorphism is an idealized state that biologists hypothesized to explain genetic change.

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d

What do we call an individual that has inherited two identical alleles for the same trait? a. homozygous b. heterozygous c. monozzygous

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos