How do fossil fuels contribute to air pollution? A. by releasing carbon dioxide into the air
B. by recycling oxygen
C. by reversing the greenhouse effect
D. by releasing nitrogen into the air

Enzymes are proteins that speed up reactions by providing an additional energy source supplying additional molecules for the reaction removing inhibitors that slow down reactions lowering the amount of energy required

Your two friends just told you what to order for them at the drive through fast food restaurant. you give the order but when the food comes about 10 minutes later, you don't remember what each of your friends ordered your memory of the order was in __ memory. a. semantic b. flashbulb c. long-term d. short-term i think i know but i'm not really sure

Explain why it’s important for scientists to study the sun. list at least two challenges researchers face when examining earth’s nearest star.