Why don't humans call have cell walls?

Why do mountaineers become breathless as they reach high altitudes

Which of these is not an obstical to the future of space exploration? fundingresearch ideas technologytime

Which of the following accurately describes the correct order of events in the process of transpiration within a plant? a. water enters the roots, passes through the leaves, and leaks through the stem pores. b. water enters the roots, gets transported through the stem, and evaporates through the leaves. c. water is absorbed through the leaves, is transported through the stem, and nourishes the roots. d. water is absorbed through the leaves, nourishes the roots, and leaks through the stem pores.