a) what are the dependent & independent variables?

an independent variable is a variable that we choose to change to see that happens. ( eg. the temperature when testing evaporation).

a dependent variable is the variable that we measure. ( so maybe how much water evaporates)

independent variable--can be controlled or manipulated.

dependent variable--is affected by changes made to the independent variable.

also important:

control variable (constant variable)--remains the same throughout the entire experiment.

Explanation:

answer: after carbon dioxide enters the leaf through stomata it moves into the mesophyll cells where photosynthesis occurs and glucose is constructed. respiration occurs when glucose (sugar produced during photosynthesis) combines with oxygen to produce useable cellular energy.

explanation:

the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.