Identify a structure in organisms that do not have kidneys that is adapted to regulate water

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

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.