<span>Enzymes
These are characterized by macromolecular natural impetuous with catalysts that quicken synthetic responses. The particles where upon proteins may act are called substrates and the chemical changes over the substrates into various atoms which are their by products</span>
1. The phrase Darwin used to describe his broad theory of evolution is ''descent with modification.
2. All of life is related through common ancestry, accounting for the Unity.
Um probably 4 because I got a little hungry
Answer:
Skeletal muscle tissue is composed of cells called muscle fibers. When the nervous system signal reaches the neuromuscular junction a chemical message is released by the motor neuron. The chemical message, a neurotransmitter called acetylcholine, binds to receptors on the outside of the muscle fiber.
