AP BIOLOGY

Detailed explanation-1: -In unicellular organisms, no specialized organs for the removal of waste materials are present, their wastes are removed directly through the cell membrane by the process of diffusion.

Detailed explanation-2: -In Amoeba, the waste material is ammonia rather than carbon dioxide. It is excreted through the process called diffusion from the surface of the body to the surrounding water. Amoeba has no excretory organs like most multicellular animals.

Detailed explanation-3: -Final answer: In many unicellular organisms, waste products are removed by the process of diffusion.

Detailed explanation-4: -Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration. Poriferans such as Euspongia and Spongila excretes by diffusion.

Detailed explanation-5: -Diffusion is a method of movement of substances within cells, as well as for movement of essential small molecules across the cell membrane. Single-celled and simple multicellular plants do not have complex structures like xylem and phloem and the movement of substances take place by diffusion.