Mutations occur when
a. organisms need a new trait to survive
b. organisms desire new traits
c. mistakes are made when chromosomes are copied
d. environmental factors force an organism to change its traits

i believe it is a or d. can you explain your answer?

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

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.

Someone me with this: a mineral' is determined by its actomic structure.