C. The liquid in Beaker A is not as dense as the liquid in Beaker B.
Photo receptors are attached to the retina and are most numerous specifically at the fovea
The person who studies living things is called a biologist
I believe that the best answer for this question is "gene mutations." Gene mutations can either take place through nucleotide substitutions, which occur when the the sequence of nucleotides are altered. Frameshift mutations can also occur. They involve the insertion or deletion of a DNA molecule's bases. Hope this helps.
The answer is option a hope it helps
