Answer D because humans can effect the way of life in an ecosystem and things like climate can effect them too
Dark reactions<span> make use of these organic energy molecules (ATP and NADPH).</span>
Exchange of gases in fish is very efficient because of: the large surface area of the gills. the large surface area of the blood capillaries in each gill filament. the short distance required for diffusion – the outer layer of the gill filaments and the capillary walls are just one cell thick.
The second stage of prenatal development begins at about two weeks after conception. at this point, the growing bundle of cells is called an embryo.
