Answer:
horns and hooves
Explanation:
horns and hooves are made of kerotin, just like nails and hair.
I had to look for the options and here is my answer:
Based on the attached details about the cattle egrets, how an ecologist would explain this expansion is that, a habitat that has been not been occupied by the egrets and the native herons acquired the biotic and abiotic standards <span>of the cattle egret transplants and their descendants. (This is based on the actual option attached to this question.)</span>
Answer:
Electron shells
Explanation:
Electron shells surround the nucleus of an atom. Each shell has its own energy level, meaning it can contain a specific number of electrons at any given time.