Answer:
A DNA marker
Explanation:
also known as a size standard or a DNA ladder) is loaded into the first well of the gel. The fragments in the marker are of a known length so can be used to help approximate the size of the fragments in the samples.
Answer:
Explanation:
maintaining a stable environment controlling what enters and exits the cell movement of materials into the cell
They only tested two to have a solid hypothesis you need a larger group.