Why Mammals with a high rate of respiration need to have a high heart rate.
问题描述：
Why Mammals with a high rate of respiration need to have a high heart rate.
答
为什么哺乳动物具有高利率的呼吸都需要有一个高心率。
与呼吸作用的一种高速率的哺乳动物为什么需要有高心率。
答
sorry。。ican not！
答
Because high heart beating rate can speed up the blood circulation in order to carry more oxygen for the body.
答
Because they need to pump the blood to everywhere of the body to keep high level of blood and oxygen.