Answer:
barter trade
Explanation:
because you exchange goods
Extinct is correct. When no members of a species remain, the species is said to be extinct.
Independent assortment occurs spontaneously when alleles of at least two genes are assorted independently into gametes.
Answer:
Energy cannot be destroyed but moves from one state to another
Explanation:
In an ecosystem the dependence on energy is one of the main driving forces. Most animals and plants are always growing, changing location and moving and all these functions require energy. The energy after transformation from the sun, is referred to as biomass and the transfer of energy from one organism to another is called a food web.
The answer is:
D. Matter and energy can change forms and locations in ecosystems.