Photosynthesis is an example of

a) an exothermic reaction.
b) an endothermic reaction.
c) a reaction that gives off heat.
d) a reaction that emits energy.

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

In this experiment, the was intentionally manipulated. it is the independent variable. the dependent variables that were measured were the