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9966 [12]
3 years ago
7

P waves can travel through Earth's outer core, but S waves cannot, Because of this, scientists know ....?

Biology
2 answers:
Daniel [21]3 years ago
5 0

please ad more detail please. please. please. XD


Grace [21]3 years ago
3 0

sound waves it travels in a straight line and p waves travel in wavy lines

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What characteristic of cardiac muscle causes contraction of the heart as a unit?
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The cardiac muscle has intercalated disk that allows rapid transmission of the impulse. This will allow the cardiac muscle to have a coordinated way. The heart muscle has pacemaker that will spread the signal in regular time. The transmission of impulse is also controlled by a few checkpoint like the bundle of his to make the signal to the Purkinje fiber of left and right ventricle at the same time.
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Choose the correct order of steps for the synthesis of Vitamin D.
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Answer:

The correct answer will be option-

1. UV light strikes the skin and converts a steroid molecule into an inactive form of vitamin D.

2. Inactive vitamin D is transported to the liver where it is modified.

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Explanation:

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The inactive vitamin is synthesized in the skin when the skin is exposed to UV rays.  The UV rays convert the 7-dehydrocholesterol, a steroid molecule to Vitamin D3, This inactive vitamin is then transported to the liver where it is converted to 25-hydroxyvitamin D.

This vitamin D form is further metabolized in the kidney controlled and regulated by the Parathyroid glands.

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