<span>Clostridium perfringens and Salmonella</span>
Unicellular organisms consist of one cell only that performs all vital functions including metabolism, excretion, and reproduction. They are responsible for obtaining nutrients, producing energy, and making proteins.
Any area in a damp or closed surface.
Sponges are the simplest bilateral animal and do lack a body cavity. A sponge has two layers of tissue.
