AP BIOLOGY

Detailed explanation-1: -All species of animals, land plants and most fungi are multicellular, as are many algae, whereas a few organisms are partially uni-and partially multicellular, like slime molds and social amoebae such as the genus Dictyostelium.

Detailed explanation-2: -Animals are multicellular, which means they have many cells. 2. Animal cells do not have cell walls.

Detailed explanation-3: -All members of Animalia are multicellular, and all are heterotrophs (that is, they rely directly or indirectly on other organisms for their nourishment). Most ingest food and digest it in an internal cavity. Animal cells lack the rigid cell walls that characterize plant cells.

Detailed explanation-4: -Unicellular organisms are made up of only a single cell. There are millions of kinds, from yeasts to algae and bacteria, but there are also little unicellular animals, such as the ‘slipper animalcule’. Unicellular organisms are made up of only a single cell.