What term is used to describe artificial selection to obtain desired qualities in breeding pets and livestock?

a. selective breeding
b. negative selection
c. survival of the fittest
d. environmental selection

Ithink it is space that makes up 70 percent

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.