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