Which values do scientists compare when using potassium-argon dating?
o the number of stable and unstable parent atoms
o the number of non-decayed elements left in the rock
the amount of parent and daughter material trapped in the rock
o the amount of gas from the decayed material that has escaped from rock

What does it mean for a cell membrane to be selectively permable

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

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.