The answer to question 1 is A.
The answer to question 2 is C.
I think the cytoskeletal protein that helps a cell maintain its shape is actin.
the most often the start of a scientific investigation. is observation
The outward appearance of a trait is called a phenotype.
The phenotype of the organism can differ from the genotype(genetic makeup of a trait). This can happen if one half of the trait is dominant over the other half, creating the trait the dominant side 'codes' for.