Internal Stimulus means to motivate from within.
They are eukaryotes, multicellular, have nuclei, and have cell walls.
Their cells have nuclei that contain DNA --- nova net
When a mouse runs for cover in the presence of a cat the cat is an example of an external stimulus. Mice have an innate fear of cats, but the cat itself would be an external stimuli.
It is a statement of succession.
Isolated populations evolve differences gradually as they adapt to the environment
The way a particular species of bird constructs its nest is an example of _____.