Calculate A CFL produces approximately four times more light output per watt than incandescent lamps do. This means that a 100-W incandescent lamp can be replaced
with 25-W CFL. If you replaced 15 100-W bulbs with 25-W CFLs, how many fewer watts
of power will you use? If your electric bill for the incandescent lights was $20 in a month
and you use the CFLs for the same number of hours, what would the new bill be?

when atmosphere interacts with biosphere they focuses on on the sources and sinks of green house gases (ghgs) air pollutants, particular matters, water and energy between the earth's surface and the atmosphere. the biosphere affects the climate. the atmosphere and biosphere are in constant interaction with each other, and all living things rely on gases in the atmosphere for life. organisms such as animals take in oxygen gas form the atmosphere to use in every cell of their body for smooth functioning of daily routine exercises.

i believe the answer is c. "baking" is the gerund, while "baking blueberry muffins" would be the gerund phrase. hope this ! : )