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Andrews [41]
3 years ago
9

Recommended dietary allowances were first published in which decade?

Biology
1 answer:
serg [7]3 years ago
8 0
Was it in the 1940's????
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Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology?
sasho [114]

Answer:

bones

Explanation:

The x-rays go through the soft tissue of things like organs, muscles, skin, etc, but is reflected by denser, less penetrable bones.

Hope this helps!

3 0
4 years ago
Fill in the blanks to complete the passage. Geologists can use ________ waves to learn about Earth’s interior. P waves travel fa
Kisachek [45]

Answer:

Seismic waves,    Outer,    Mantle

Explanation:

P-waves vibrate longitudinally to the direction of propagation while S-waves vibrate vertically to direction of propagation. This is why S-waves are called shear waves while P-waves are compressional waves. S-waves are the main cause of destruction in an earthquake and are slower than P-waves.

The wave movement of P-waves allows them to pass through liquids and gases while S-waves cannot. Due to this differential phenomenon of these waves, the reflection of P –waves and S-waves after an earthquake – and as their vibrations are picked up by seismographs around the earth - enabled scientists to determine the properties of the  layers of the earth’’s interior.

8 0
4 years ago
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А what
kifflom [539]

Answer:

volcano flood

Explanation:

it's right I took the test

3 0
3 years ago
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DNA strand replication begins with an RNA primer. DNA strand replication begins with an RNA primer. True False
nikitadnepr [17]

Answer:

true

Explanation:

DNA synthesis is performed by the enzyme DNA polymerase. However, DNA polymerase requires the presence of a free 3' OH on the existing DNA or RNA segment. The enzyme primase forms small RNA segments that serve as primers. Primers are formed by using the DNA template strands and have free 3' OH ends. DNA polymerase extends the primers by adding deoxyribonucleotides according to the sequence of the DNA template strand. Therefore, DNA polymerases are the enzymes of primer elongation.

6 0
3 years ago
Why is it a good idea for humans to create models of how populations are changing?
Contact [7]
So we can look back and see how much we have accomplished in the year with the models
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