Question

Brothers and sisters often have similar facial
characteristics, such as nose shape or eye color,
because they
(1) are raised in similar environments
(2) eat similar types of foods
(3) have similar types of proteins
(4) use similar types of facial care products

Answer 1

Since its a biological question, I think it's 1 as I am assuming that sharing the same environment means the same parents/household thus the siblings share the same genes.

Answer 2

Answer: 3

Explanation: they share similar types of proteins.