AP BIOLOGY

Detailed explanation-1: -In unicellular organisms, since they do not have any specialized organs for the removal of waste materials, their wastes are removed directly through the cell membrane by the process of diffusion.

Detailed explanation-2: -Final answer: In many unicellular organisms, waste products are removed by the process of diffusion.

Detailed explanation-3: -In unicellular (single-celled) organisms, diffusion across the cell membrane is sufficient for supplying oxygen to the cell. Diffusion is a slow, passive transport process. In order to be a feasible means of providing oxygen to the cell, the rate of oxygen uptake must match the rate of diffusion across the membrane.

Detailed explanation-4: -When the surface area to volume ratio is large, there is a lot of surface area for diffusion and not much volume to travel within. This is the case for unicellular organisms, which can rely on diffusion alone to get the substances they need.

Detailed explanation-5: -excretion, the process by which animals rid themselves of waste products and of the nitrogenous by-products of metabolism. Through excretion organisms control osmotic pressure-the balance between inorganic ions and water-and maintain acid-base balance.