Birds of a species have different sized and shaped beaks. What is this an example of? survival of fit individuals variation overproduction

When analyzing tree rings, what do scientists assume a thin ring indicates?

The negative impacts of nonnative species generally outweigh the positive impacts

Migration is a. the movement of organisms from a native location to a foreign location b. the movement of organisms from a foreign location to a native location the movement of organisms from their water supply to their food supply d. the seasonal movement of organisms between locations c. select the best answer from above