The hiv virus, the virus which causes aids, can be transmitted by many different means. all but one is a proven way for the hiv virus to be spread and that is a) mosquito bites. b) blood transfusion. c) sexual intercourse. d) sharing needles through intravenous drug use.

Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll? osmosis diffusion passive transport active transport

Aflashlight battery is an example of a) potential energy b) kinetic energy c) thermal energy d) solar energy

In the practice of science, this type of reasoning is used to develop explanations.