A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction. The most popular model that describes muscular contraction is called the sliding filament theory.
Answer:
XX
Explanation:
A women's phenotype will always stay the same as XX.
A (:
cosmic radiation is technically just a type of radiation. radiation is beta particles shot out at the atomic level