What is the difference between there, their, and they're?
They're is a contraction of they are, their is possessive, and there is a place.
What does colostrum do for a foal?
Colostrum is important for a foal, because it gives them passive immunity! It is important to make sure the foal nurses in the first few afters after birth so that it is able to absorb the antibodies.
What is the uppermost layer of soil, and what does it consist of?
The uppermost layer of soil is called the "O Horizon," and it consists of organic matter and decomposed things such as leaves.