many things : life cells matter inertia force weight
Each other
Cold Blooded and Warm blooded animals have a common trait with each other, they both have red blood
Animals that normally don't come near each other will be weary of each other. These animals could choose not to interact for example.
To animals and plants
no
There are some animals which depend on each other to live. Like....ants. They provide shelter for themselves and each other.
Why animals are aggressive towards each other is usually for dominance and like that is their territory not your territory.
Many types of animals mimic each other in order to gain an advantage. Squid are one of these animals that perform mimicry.
they hump each other
you
yes
social ones