organism from whom one is descended.
large phylum of aquatic animals (such as jellies and corals) characterized by radial body symmetry and stinging tentacles.
change in heritable traits of a population over time.
having to do with genes, inherited characteristics or heredity.
animal without a spine.
animal with hair that gives birth to live offspring. Female mammals produce milk to feed their offspring.
living or once-living thing.
study of how organisms relate to each other as they develop over time.
group of similar organisms that can reproduce with each other.
organism with a backbone or spine.