Extra credit:

assume that the average animal cell is 20 micrometers in length and the average plant cell is 50
micrometers in length. given 1000 micrometers is equal to millimeter, what is the scale of your
model? how many times longer is your model of a cell compared to an actual cell in terms of
length?

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.

Long term exposure to waves can cause sunburns and skin cancer.

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