Which has prokaryotic cells?
a) human blood
b),cows liver
c) onion root
d) ecoli

Describe five factors that influence the value of fuel

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.

What are the student's observations and inferences before he starts his investigation?