If earth a "closed system," how does that shape the outcome of environmental problems? how does this relate to local or regional environmental problems?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

What is a sex-linked genetic disorder that disrupts the blood's ability to clot? a.achondroplasia b.huntington's disease c.hemophilia d.albinism

One reason scientists are trying to develop fuel sources from corn and sugar is because these sources are renewable fossil fuels are being depleted these crops can be widely grown all of the above