The spots on a fawn's coat let it hide in shady areas without being seen. The viceroy butterfly looks like the bad-tasting monarch, so birds avoid both. The hognose snake hisses and rolls on its back when it fears another animal. When the opossum is attacked, it plays dead. Distressed turtles hide in their shells until they're sure it's safe to come out again.

These Animals use various ways to protect or defend themselves.

Explanation:

The fawn uses camouflage to blend in with the environment to hide away from larger predators

Viceroy butter looks like a monarch is an example of Batesian mimicry to avoid being eaten.

The Hog nose snake uses acoustic Batesian mimicry to scare away a possible predator

The opossum uses the death-feigning strategy to  play dead when it is in danger of being threatened. The predator is disinterested and eventually leaves.

Turtles retreat into their shell as an avoidance mechanism to protect them from predators, threat and environmental factors.

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex