True because the mitochondria is the major organelle that provides energy for the body
What is part B I need more info.
<>"A further increase in the size of a cell could result in a surface area too small for adequate exchange of materials. Google: A large surface to volume ratio means that a small amount of living matter has a large surface through which nutrients, oxygen and wastes can diffuse."<>
I believe it would be determining the true age if rock layers. Hope this helps :)