Territorial behavior is animal social behavior. These elephants are showing territorial behavior because the older elephant is showing the younger one that it is the boss. It shows that they don't want the other one to think that they can be the main elephant.

Pine needles are thin so the tree can survive the winter better. If it were too big, then the snow would easily break the leaves. There is a small gloss on the needles, so water and snow falls right of the needle.

This moss is being a parasite to this tree because it takes away the nutrients that the tree needs for itself. It is attached to the tree and using the trees food for its own needs.

In a sense, an insect has its skeleton outside its body. The insect's body wall is hardened (the technical term is sclerotized) so that it becomes like a shell over the insect's body. Since insects don't have bones, the shell serves as the body's skeleton. Because the skeleton is outside the body, it's called an exoskeleton

Two or more species having a close ecological relationship evolve together such that one species adapt to the changes of the other, thereby affecting each other's evolution. Gunnar (my kitty) gets food from me because I feed him and he helps me to evolve because I kinda remember to feed him...

This happens to be a kitty and his adaptation is that the actual eye is smaller and can absorb light so they can see in the dark. This is helpful when they are hunting and even when they are just walking around at night.

The type of egg produced by reptiles, birds, and prototherian (egg-laying) mammals (amniotes), in which the embryo develops inside an amnion. The shell of the egg is either calcium-based or leathery. These eggs are from ostriches!