Malaria is caused by: a. a particular bacteria b. a virus c. a protozoan d. a parasitic rickettsia

Malaria is a diseases that affects animals, and humans. Malaria is causes by a parasitic. Which means the answer would have to be option D "a parasitic rickettsia." Malaria symptoms are: fever, tiredness, vomiting, and headaches. Malaria is a very common disease by a single cell micro organism.

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.