:) A student was asked to test the hypothesis: Catalase activity is the same in all species of plants. Plan an investigation to test this hypothesis.​

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

When the cell concentrates potassium within, against the natural tendency of matter, it is performing a. passive diffusion b. facilitated diffusion c. active transport d. pinocytosis