Don't quote me on it but I believe the first one was Democritus in the time of Ancient Greece. At the time he had no evidence though, just a lucky guess made by him.
Answer:
true
Explanation:
there are differents bears and they live in completly different biomes
Answer:
I don't even know what this is, I need more information
The integumentary system consists of the skin, hair, nails, glands, and nerves. Its main function is to act as a barrier to protect the body from the outside world. It also functions to retainbody fluids, protect against disease, eliminate waste products, and regulate bodytemperature.
Answer:
The cell part that allows only certain substances to diffuse into and out of the cell is called the semi permeable membrane.
