The pumping of the heart involves the alternate contraction and relaxation of the chambers of the heart. the upper chambers of the heart are called , and the lower chambers of the heart are called .

In which process is oxygen absorbed by an organism asap apex

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?

Involving transcription and translaton. explain the causes and effects of damage to the genetic code.