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Epithelial tissue is the last barrier for muscle to the outside world, such as skin. 

Hermaphrodite is an organism with all the parts to reproduce on its own, such as a flower.

Mutualism is when two organisms benefit each other. Flowers feed hummingbirds and hummingbirds pollinate for them.

I couldn't think of a 'population' picture, so I'm just going to use it in a sentence. "The population of dogs in this photo is nonexistent."

Rhizomes are roots that sprawl and grow more plants from each root, such as in ginger.