Before dna was discovered, in which materials did scientists think the genetic material was stored

Proteins

Explanation:

In the past, scientists believed that DNA was stored in proteins. Today we know that this is not true. The DNA is stored in the cell nucleus.

Proteins have an extensive list of functions in the body and are found in all cell structures, interstitial substances, antibodies, among others. Among the functions that can be attributed to proteins, its role in transporting oxygen (hemoglobin), in protecting the body against pathogenic organisms (antibodies), as a catalyst for chemical reactions (enzymes), membrane receptor, acting in contraction muscle (actin and myosin), besides being fundamental for the growth and formation of hormones.

"a.) well–developed vascular system."

paper covers rock.

explanation:

rock only smashes scissors.