some studies suggest that an anxiety gene affects the brain's level of the neurotransmitter what

What are two reasons for why a species might disappear from the fossil record?

What would happen if the krill were removed from the food web

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .