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german
3 years ago
11

What are the three first eons collectively known as?

Biology
1 answer:
Dafna11 [192]3 years ago
8 0

Answer:

Hadean, Archean, and Proterozoic Eons are currently all lumped together and they are all called/referred to as the Precambrian

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When plates slide past each other, the edges of these plate blank zones
atroni [7]

Answer:

A. Earthquake

Explanation:

When plates slide past each other, the edges of these are earthquake zones. Earthquakes are formed but not volcanoes.

8 0
2 years ago
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Which of the following is not a characteristic of life?
valentinak56 [21]

Answer:

Change their external environment is the correct answer.

6 0
2 years ago
Photosynthetic cyanobacteria caused an increase in atmospheric levels of
goldfiish [28.3K]

C...the key is that they are photosynthetic...so they produce oxygen (like plants)!

6 0
3 years ago
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Which of the following explains why water is a good solvent for polar and ionic compounds?
Anni [7]

Hi there!

<u>Electronegativity</u> is the concept of how likely an atom is to attract the shared molecules in one of these bonds to itself. We know the molecule water is made up of two hydrogens and one oxygen. The electronegativity of hydrogen is 2.2, and oxygen 3.4. An <u>ionic bond</u> needs at least a difference in electronegativity of 1.6. As the difference is less than that, we can say that water is a covalent molecule. This then wipes out choice B, because it is not ionic, and C, as we have seen it is actually covalent.

Now, we can see the difference in electronegativity between oxygen and hydrogen is still 1.2. This means that while it is not at the point for there to be an ionic bond, there is still a difference in attraction, where the electrons will tend to favor the oxygen more and 'hang around it' more. As electrons are <u>negatively charged</u><em><u>,</u></em> this means that the oxygen will gain a slightly negative charge. This then makes the molecule polar, because it now has a charge within the molecule. This means we have our answer, choice D.

In terms of hydrophobic molecules - they tend to be ones without a charge. (If you're interested in this kind of stuff, I'd search hydrophobic up, and possibly also look into hydrogen bonds).

Hope this helps! Feel free to ask me any other questions you have about this specific problem.

6 0
3 years ago
We can tell from their structure that fatty acids are a good source of energy because of:
jekas [21]
We can tell from their structure that fatty acids are a good source of energy because of their large number of carbon-hydrogen and carbon-carbon bonds that they contain. Most fatty acids have straight chain compounds with an even number of carbon.
3 0
3 years ago
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