<span>Competition happens within groups of the same species, so it's A. There isn't competition within different species, rarely.</span>
Phagocytosis would enable a white blood cell to ingest a bacterium
Phagocytosis is a special form of endocytosis by which cells ingest solid substances including microbial pathogens to produce an internal compartment known as a phagosome. Cells that undergo this process are called phagocytes. The white bold cells of the immune system protect the body against invasion by pathogens such as bacteria. They perform this function by phagocytosis.
By diffusion. Letter c.
Diffusion occurs when the smell of the bread "sticks" to the air and if the air travels from a room to another, the smell will go with it.
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The cell membrane consists primarily of a thin layer of amphipathic phospholipids. They Spontaneously arrange so that they form a continous, spherical lipid bilayer