Answer:
A
Explanation:
my answer is A because it is correct
Traits usually result in sexual selection.
It is b . Because three of them are less than 90.
Answer:
As the thin filaments slide inward, structures called Z-discs come toward each other and the sarcomere shortens but the lengths of thick and thin filaments do not change. The sliding of the filaments and shortening of the sarcomere cause shortening of the whole muscle fiber and ultimately the entire muscle.
<span>Protein is made up of building blocks called amino acids</span>