I think the correct answer from the choices listed above is option B. Keratin is the protein in mammals which shows only a primary and secondary structure. Keratin is a fibrous protein forming the structural constituent of hair, feathers, hoofs, claws and many others.
Answer:
Chromosomes
Explanation:
Chlorophyll and chloroplasts are both something plants create.
Answer:
well I am quite unsure but I need points so sry man
