Biology, asked by zainaba17, 5 months ago

the structure responsible for starting electrical impulses that causes the heart to contract and relax in order to keep pumping blood .
the scientist who identified different types of blood groups.

Answers

Answered by chilliefries

3

Answer:

SA node

Explanation:

fact

hope it helps

Answered by justiceforssr06

3

Answer:

Karl Landsteiner -Discovered Blood groups

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