Answer:
D.
Explanation:
I found it on quizlet. Hope this helps!!
The heartbeat has two specialised areas of muscle (the sa node and the av node) that control and synchronise the heartbeat. The rhythm of relaxation and concentration of the pacemaker sets the rythym of the heartbeat.
Explanation:
C. Semi-Conservative
i believe this is the answer
I can’t answer 7 because I can’t read the writing on the papers in the image. But for 8, it is important to classify living things because it makes it easier to study and understand the behaviors, lives, and the evolutionary progression of millions of life forms
