When the temperature reaches 600 C, any remaining liquid quenches to form glass. Assuming that the minerals average at least several millimeters in size, what rock have you just formed? What is the temperature of the substance when it is in its standard state?

artificial selection

explanation:

this occur when man select base on their intelligent

can i have a list of the items?

the right option is; decreased genetic variation  

decreased genetic variation describes the effect of this environmental change.

genetic variation is the naturally occurring genetic diversities or differences between organisms of the same species in a population. genetic variation allows the survival and adaptability of a species when they encounter changing environmental conditions. when an endangered species reduces, it loses genetic variation which may not be restored even if the species rebound and will only be recovered through the gradual collection of mutations over many years.