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Cerrena [4.2K]
3 years ago
13

The actual age of rocks can be determined by radioactive dating. a. True b. False

Biology
1 answer:
oee [108]3 years ago
6 0

Answer:

a. True

Explanation:

The absolute age of rocks can be determined in two ways: by fossil content or by radioactive dating, which uses the natural radioactivity of rocks. If the rock contains fossils, its age will be the age of those fossils. This is very simple, but it is a method with huge limitations. Not every rock contains fossils; the igneous, for example, never have them. And even when the rock contains remains or traces of animals or plants, they can be difficult to obtain.

When molten rock cools to form what we call igneous rocks, radioactive atoms are trapped inside. Later they decay at a predictable rate. By measuring the number of unstable atoms remaining in a rock and comparing it to the number of stable atoms in that rock, scientists can estimate how long it has been since the rock was formed by radioactive dating.

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Which of the following is a product of respiration resulting from the breaking of carbon-carbon bonds?
4vir4ik [10]

Answer:

Carbon Dioxide

Explanation:

Its what we breathe out.

3 0
2 years ago
How would you explain the process of rock changes​
sergiy2304 [10]

Answer:

cooling of lava or magma makes igneous

sedimentary rock is formed when sediment gets deposited, and is hardened by compaction and cementation.

any rock can turn into a metamorphic rock when exposed to extreme heat and pressure

5 0
2 years ago
Cholesterol's main role in the membrane seems to be:
olga nikolaevna [1]

Answer:

E) Improve membrane fluidity

Explanation:

Cholesterol constitutes the basic structural element of the skeleton of cell membranes. Without their reinforcement, the membranes would become extremely fluid and lose their consistency. Cholesterol is found in the esterified membranes in its hydroxyl group (OH): with fatty acids, mainly oleic and linoleic, or as cholesterol sulfate. The cholesterol-sulfate polar group is disposed on one of the faces of the membrane that interacts with other polar groups in that area, while its bulky hydrophobic portion is embedded between the apolar parts of the lipids that form the membrane skeleton and They fulfill many other functions, among which the reduction in the permeability of protons and sodium ions, and their participation in signal transmission. Cholesterol is also essential in phagocytosis processes carried out by cells to capture many nutrients and, in general, for the function of cleaning up organic waste produced by macrophages.

The membranes must have a fluid structure so that the integrated proteins can move "horizontally" to interact with their ligands and with other proteins. The fluidity is given by unsaturated fat. With the excess of saturated fat, the membranes become rigid, but only with the necessary unsaturated fat the membranes are extremely fluid and very sensitive to temperature changes. Cholesterol stabilizes the structure of the membranes; In order for them to have the correct structure, they must have the correct proportions of saturated, unsaturated fats and cholesterol. The membranes produced in the laboratory without cholesterol are unstable to temperature changes, drastically modifying their fluidity against the small temperature changes that occur in the physiological range.

In addition to its functions in cell membranes, cholesterol is an important product that metabolism uses as a raw material to make other compounds:

*Bile salts

*Sex hormones

*Hormones of the adrenal cortex (corticosteroids)

*Vitamin D (Calciferol)

3 0
3 years ago
Single-celled or unicellular fungi are: molds monolyathids protoplasm yeasts
Tju [1.3M]
The answer is yeasts.

Fungi is the kingdom of Eukaryota domain and includes unicellular organisms and multicellular organisms. Y<span>easts are u</span>nicellular fungi. But, some species have an ability to develop some kind of multicellular characteristics such as pseudohyphae that forms by connecting budding cells.
8 0
2 years ago
Read 2 more answers
7. another word for eating<br><br>science order and design​
Nuetrik [128]

Answer:

devour

Explanation:

the biology name ( another name) of eating is devour.

5 0
3 years ago
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