Explain how cells obtain energy?

Most animal cells membranes have proteins that pump ions out of the cell and potassium ions into the cell

Which of the following statements best distinguishes a hypothesis from a theory? a. theories are hypotheses that have been proved. b.hypotheses are guesses; theories are correct answers c. hypotheses usually are relatively narrow in scope; theories have broad explanatory power. d. theories are proved to be true; hypotheses are often contradicted by experimental results.

What type of tree is the tallest tree in the world?