Coal is solid rock that began as organic material that was deposited in a swamp. the formation of coal suggests that a. geologic processes continue over millions of years. b. coal is made mostly of skeletal remains of animals. c. coal is formed from magma that has solidified over time. d. it quickly becomes petrified when water is removed.

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

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.

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?