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Lelu [443]
3 years ago
13

Charles Darwin developed the theory that explains how new species develop based on evidence from many different kinds of scienti

fic inquiry. Darwin’s theory can only be accurate if the earth is very old. The scientists who provided evidence for the earth’s old age were most likely
Biology
2 answers:
sleet_krkn [62]3 years ago
6 0
Archeologists are the scientests
arsen [322]3 years ago
6 0

Answer:

In the 19th century, the British physicist Lord Kelvin made an estimate of the age of the earth. He said the earth was approximately 100 million years old.

He relied on calculations of the cooling of the earth from its original state of fusion.

However, with new techniques, scientists claim that the age of the earth is 4600 million years.  Actually is used the isotope marking technique

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Briefly describe the properties of lipid bilayers and how this dictates membrane permeability. Be sure to mention which types of
ladessa [460]

Answer:

Lipid bilayer can be defined as a polar membrane, which composes two layers, made up of lipid molecules. It shows both hydrophobic (due to non-polar tails of lipid molecules) and hydrophilic (due to polar heads of lipid molecules) nature, and hence is known as of amphipathic nature.

Lipid bilayer shows selective permeability as not all molecules can cross the lipid bilayer. It can pass non-polar, small, uncharged molecules due to its hydrophobic core, such as oxygen, water, urea.

On the other hand, polar, large, or charged molecules, such as glucose, amino acids, and ions cannot pass through lipid bilayer. These molecules require transport proteins for their transport, which are embedded in lipid bilayer.

he lipid bilayer has unique properties. They are formed in sheet-like structures that contain both a hydrophilic and a hydrophobic moiety. The membrane is composed of lipids and proteins and sometimes even carbohydrates. There are two different membrane proteins in the lipid bilayer.

8 0
4 years ago
What stimulates the secretion of parathyroid hormone from the parathyroid gland?.
gavmur [86]

Answer:

Low calcium levels in the <em><u>blood</u></em>

Explanation:

In primary hyperparathyroidism, one or more of the parathyroid glands is overactive. As a result, the gland makes too much parathyroid hormone (PTH). Too much PTH causes calcium levels in your blood to rise too high, which can lead to health problems such as bone thinning and kidney stones. <em> </em><em>this</em><em> </em><em>w</em><em>i</em><em>l</em><em>l</em><em> </em><em>h</em><em>a</em><em>p</em><em>p</em><em>e</em><em>n</em><em> </em><em>i</em><em>f</em><em> </em><em>p</em><em>a</em><em>r</em><em>a</em><em>t</em><em>h</em><em>y</em><em>r</em><em>o</em><em>i</em><em>d</em><em> </em><em>h</em><em>o</em><em>r</em><em>m</em><em>o</em><em>n</em><em>e</em><em>s</em><em> </em><em>g</em><em>o</em><em>t</em><em> </em><em>h</em><em>i</em><em>g</em><em>h</em><em> </em><em>i</em><em>n</em><em> </em><em>h</em><em>u</em><em>m</em><em>a</em><em>n</em><em> </em><em>b</em><em>o</em><em>d</em><em>y</em><em>.</em><em>.</em>

5 0
2 years ago
Read 2 more answers
Why weren't any of them green
Anastasy [175]

Answer:

Green can be seen as a gross color to some

Explanation:

6 0
3 years ago
What did this hypothesis most likely need before it became part of an accepted theory?
Black_prince [1.1K]

Answer:

for a hypothesis to be part of an accepted theory, it must have been extensively tested through experiments under different conditions

3 0
3 years ago
What is the function of the enzyme amylase?
timurjin [86]

Answer:

Explanation:

Amylases' main function is to hydrolyze the glycosidic bonds in starch molecules, converting complex carbohydrates to simple sugars. There are three main classes of amylase enzymes; Alpha-, beta- and gamma-amylase, and each act on different parts of the carbohydrate molecule

5 0
2 years ago
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