Thinking like a scientist, you predict that washing your jeans more often will cause them to fade faster than a pair you wash fewer times. What would be your next step if conducting a scientific investigation? A. test the hypothesis.
B. analyze the observations.
C. ask a question.
D. make a prediction.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Which best explains how a heat pump can heat a room? cold air from the house is moved through pipes, where it absorbs thermal energy. warm air from outside is pushed into the house to replace the cold air. combustion warms the air when chemical energy is transferred to thermal energy. fuel is used to move a piston, which pushes warm air into the house.

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land