<span>The heart has two receiving chambers (the right and left atria) and two outgoing chambers (the right and left ventricles).</span>
I believe it is A because Living things respond to changes, each and every living organism is made up of cell and adapting to changes is same as responding to changes.So, only one left is A.
Not always because there could be birth defects, mutations, or other variables.
Answer:
I think the correct answer is D