Mrs. Price reviewed the safety precautions for working with sharp objects. Which activity most likely requires these safety practices?

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

Environmental differences within ecosystems are generally caused by

Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?