Question

fill in the blank
fill in the blank with the correct words:

1. the highest place on a mountain where trees can grow is called the

______________________.

1. one reason the timberline is moving higher up the mountain is because of

______________________ change.

1. scientists use four types of ______________________ to help investigate why

populations change: environment, food, other organisms, and reproduction.

Explanation:

1. This is a standard term in environmental/geographical science for the upper limit of tree growth on mountains.
2. Rising global temperatures (a key part of climate change) allow trees to survive at higher elevations, shifting the timberline upward.
3. These four listed factors are core components that scientists analyze as causes for population shifts in organisms.

Answer:

1. tree line/timberline
2. climate
3. factors