Question

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Answer 1

Answer:

• Skeletal muscles are attached to bones and allow voluntary movement of the body. ... Cardiac muscle is involuntary and found only in the heart. Skeletal muscle is striated in regular, parallel bundles of sarcomeres.

• Changes which are repeated after regular intervals are called periodic changes. The occurrence of day and night and even the change of periods in your school are examples ofperiodic changes. Changes which do not take place periodically, such as freezing of water to form ice, are non-periodic changes.

• The umbra is the darkest part of the shadow while the penumbra is the lighter portion on the edges.

Answer 2

Answer:

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Explanation:

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