The heart
Ummm, I don't think there's a limit. Maybe there's a law saying you can only own a certain amount of pets or in a zoo or in a habitat. But otherwise, no limit. Because technically, humans are animals and there are about 7 billion humans alive today. ( 2011 )
about 99999,00000
Many humans ans some animals are afraid of thunder.
There are many connections between growing food, herding animals, hunting, and gathering. These are things humans do to stay alive and eat.
There are more animals than there are humans, but the overall total is constantly changing.
1,000 humans
Plenty. Abusing animals is harsh. Too many.
It is many reasons. But the most common reason is humans, who "hunts" animals. Many races in South-America and Africa have been extinct, because humans are burning down the forrest. Many animals are endangered, because humans are greedy.
Humans have unique vitamin requirements compared to other animals because our bodies cannot produce certain essential vitamins on their own, so we must obtain them from our diet. This is different from many animals that can synthesize these vitamins internally.
There are nearly twice as many kangaroos in Australia as there are humans.
Yes, many animals along with humans have the pineal gland.
many animals will die