Explain the difference between variation and competition. My kid has to turn it in today. I'll also mark you brainliest if you give me a correct answer.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

Adistinctive characteristic of mammals that is not observed in other vertebrates is

Achange in which factor will affect the rate of reaction only when gases are involved? temperature pressure surface area concentration