How many different elements are there that make up all of the matter in the world

Which three statements represent the benefits of performing experiments using computer simulations?

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?

2. what two items do autotrophs take from the environment to produce their food? 3. what are the two items that are released during transpiration from leaves? 4. what are the two membranes of the system? a.what are the two stages of photosynthesis? what are the two parts of photosynthesis?