All living things need carbon. how does carbon enter the living portion of an ecosystem?

Chalk is an ionic compound. which is a property of all ionic compounds that makes chalkboard? particularly useful for writing on a a high melting point hardness and brittleness inability to dissolve in water a multicolored appearance

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f

1. which of the following transport mechanisms utilizes energy? a. osmosis b. diffusion c. facilitated diffusion d. endocytosis