Which of the following is not a basic method used by ecologists to study the living world?
a. experimenting
b. animal training
c. modeling
d. observing

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?

An animal cell (left) and a plant cell (right) are shown.which organelle, labeled x in the diagram, is found in both plant and animal cells?

What is the most abundant vertebrate on earth?