A is an impression of the inside of an organism.
**One-word answer**

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 .

What part of the brain is highlighted in the diagram below?

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient