1. especially in some complicated experiments u need someone to help you to complete that.for example one will pour thr chemical and other can hold the beaker
2. if one of them had some lab accidents such as chemical spilled in eye the other can immediately report to an adult or teacher
Answer:
Your answer would be:
C.) Muscles
The muscular system is composed of cells called muscle fibers. Muscles, attached to bones or internal organs and blood vessels, are responsible for movement. Nearly all movement in the body is the result of muscle contraction.
Explanation:
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Answer:
organic amines contain nitrogen atoms, N, that are singly-bonded to at least one carbon atom.
Explanation:
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Answer:
When calcium concentration increases during depolarization, it shifts the conformation of troponin and tropomyosin, and actin is able to associate with myosin. As calcium is taken up again by the sarcoplasmic reticulum the muscle cell relaxes.