Question

In many unicellular organisms, waste products are removed by the process of ___________.

Answer 1

Diffusion:

1. Diffusion is the process of movement of particles from a region of higher concentration to a region of lower concentration.
2. In lower animals, excretion occurs by this method.
3. Example: In the case of Porifera, ammonia and carbon dioxide are removed by the process of diffusion.

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