Pls help 1.Which device is a heat pump? a. a fan
b. an air conditioning system
c. a wall heater
d. a jet engine

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

Against his financial advisor's advice, frank has decided to invest his money in some risky stocks because he once made quite a bit of money in the stock market. his decision illustrates a. the representativeness heuristic b. overconfidence c. the availability heuristic d. confirmation bias select the best answer from the choices provided