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Elena-2011 [213]
3 years ago
15

A radioactive element has a half-life of 1000 years. A rock contains 6.25% radioactive material. How old is the rock?

Biology
1 answer:
Natali5045456 [20]3 years ago
7 0

ANSWER:

Radioactive element life years = 1000/2 = 500yrs.

So, Rock years

  • 6.25/100 × 500
  • 31.25years.
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What is molecular polarity
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Answer:

The electron density of a polar bond accumulates towards one end of the bond, causing that end to carry a slight negative charge and the other end a slight positive charge. Likewise molecules in which there is an accumulation of electron density at one end of the molecule, giving that end a partial negative charge and the other a partial positive charge, are called polar molecules.

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biologists is studying two species of lizards in a mountainous region. The two species are separated by habitat with one species
ivann1987 [24]

Answer:

Valley lizard = Oviparous

Mountain lizard = Viviparous

Explanation:

In Darwin's theory survival of the fittest, he believed species adapt or change within their environment. So I believe lizards living in a valley would be more safe to lay their eggs but lizards living in the mountains would be viviparous because of the non-predicted and unsafe environment which could harm the better chances of development of the offspring.

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True or False? The pharynx and larynx are generally not coordinated during swallowing in an unresponsive person, making them mor
alexandr1967 [171]
<h2>Correct Answer is True</h2>

Explanation:

  • True.
  • During swallowing, the pharynx changes from airway to a food channel channel.During mastication, the food bolus  aggregates in the pharynx before swallow commencement.
  • <em>The structures in the oral pit, pharynx and larynx serve various capacities in breathing, talking, rumination and swallowing, </em>
  • Unsourced material might be tested and removed.
  • The nasal cavity, The pharynx is the piece of the throat behind the mouth and  larynx the cylinders going down to the lungs and stomach .
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3 years ago
Compare the composition of pancreatic secretions in the presence of hydrochloric acid and fat
tigry1 [53]
I'm having trouble on this too :(
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Proteins of smaller molecular size may be reabsorbed from the glomerular filtrate by the specific transport process of _________
Lesechka [4]

Proteins of smaller molecular size may be reabsorbed from the glomerular filtrate by the specific transport process of endocytosis.

<h3>What do you mean by Glomerular filtrate?</h3>

The Glomerular filtrate may be defined as the liquid in the lumen of the Bowman's capsule of the nephron that has been purified from the capillaries of the glomerulus.  

The small molecular size proteins may be absorbed from the glomerular filtrate by receptor-mediated endocytosis. Then moved into the endosomes, and finally to the lysosomes for the degradation.

Therefore, proteins of smaller molecular size may be reabsorbed from the glomerular filtrate by the specific transport process of endocytosis.

To learn more about Nephron, refer to the link:

brainly.com/question/832244

#SPJ1

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