1. What cause mutations?
amino acids
exons
mutagens
mRNA

Blood has traveled from the heart to the toes. which describes the next step of the circulation process?

Plz will mark! the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which process of living things produces water that enters the water cycle