Tại sao quá trình nhân đôi ADN lại diễn ra trước quá trình phân chia tế bào? Ý nghĩa

Acid rain throughout the northeast united states has lowered the ph of many ponds and lakes. the lowered ph will eventually result in the death of many aquatic animals. compare the map of the u.s. with the ph tolerance range for the organisms listed. based on the tolerances seen here, which aquatic organisms are least likely to survive in the northeastern states?