_____ describes an organisms suitability for its environment.
ancestry
phylogeny
heredity
fitness
fitness
Natural selection causes changes in:
an ecosystem
an individual organism
a population
a biome
a population
The total collection of genes in a population is called?
DNA dump
gene bucket
gene pool
phenotype
gene pool
Why do organisms evolve?
Over time, the variations that are within the genes of members of a population that give an advantage?
become less common in the population
become more common in the population
cause the population to become extinct
cause the population to remain at the same size each year
become more common in the population
what is it that is actually changing over a million years within a population when we consider evolution?
coloration of population
life expectancy age
genetic makeup
ability to resist disease