3.1 How Changes Occur Naturally in Ecosystems . By the end of section 3.1 you should be able to understand the following: Over time, and many generations, organisms change along with the biotic and abiotic factors in their environments through the process of natural selection .
Life Without People
- Most insects are helpful, but when normal conditions change, infestations can occur.
- Example: Mountain Pine Beetle:
Usually it is not a problem…it helps remove old trees, but….
Pine beetle has