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djyliett [7]
3 years ago
9

How do scientist use layers of rock to determine when the Great Oxidation event occured?

Biology
1 answer:
Oksanka [162]3 years ago
8 0

Answer:

Using the concept of relative dating

Explanation:

Scientists use the concept of relative dating principles to determine when the Great Oxidation event occurred.

Relative dating is the process of placing ancient event in their proper time sequence based on the relationship between rock lithologies.

  • An event like the great oxidation will have significant chemical, biological and physical effect on the rock units.
  • Rocks that form during this period in time will have very unique chemical signatures.
  • Therefore, by studying these rocks, the age of the layer can be fixed when we compare it to the standard geological column.
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Answer:Sclerenchyma

Explanation:Sclerenchyma is thick walled dead lignified cells, they are hard and elastic. The sclerenchyma cells are divided into two groups namely fibers and sclereids. Sclerenchymatous fibers are branched/unbranched, long, hard, pointed cells with tapering ends, thick walls, and narrow lumen.

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4 years ago
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How many nucleotide bases differ between your sample (labeled as O. Kisutch) and the standard sequence for O. Kisutch? Sample la
OverLord2011 [107]

The right answer is 3 nucleotide bases.

5'-CGGCACCGCCCTAAGTCTCT-3'

5'-AGGCACCGCCCTAAGTCTAC-3'

It would be necessary first to align the two sequences side by side so as to be able to compare them, and they should also be in the same direction.

The nucleotides marked in bold are the nucleotides that differ between standard and O. Kisutch.

These nucleotide changes are necessarily due to substitution mutations that exchanged one nucleotide for another in the same location.

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3 years ago
the data collected over the years clearly confirm depletion of ozone in the stratosphere. what do scientists still need to learn
Lisa [10]

<span>Ozone is simply a molecule consisting of 3 oxygen atoms, which reacts strongly with other molecules. Ozone is created in the stratosphere when high energy uv radiation causes on O2 molecule to split. The free oxygen atoms collide and react with other O2 molecules to form O3.</span>

Production is highest where the solar uv is the greatest eg near the tropics, but once created, the ozone is then circulated towards the poles by the atmosphere. The amount of ozone in the stratosphere can vary with location, season and even day to day climatic conditions.

<span>The process of ozone creation is what makes the O3 in the atmosphere very effective at shielding the Earth from harmful uv radiation, which can cause many biological problems, such as skin cancer. However, due to its high reactivity, the uv found in the tropospher at ground level can aslo be dangerous as a toxic pollutant which is harmful to plants and lung tissue, and is a major cause of smog.</span>

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If more oxygen were made available to cells that had a limited amount of oxygen, what could be the result? Select all that apply
abruzzese [7]
B and D are correct hope this helps
8 0
3 years ago
Translate the word phrase into an algebraic equation: the quotient of 24 and 2 is equal to 12.
igor_vitrenko [27]

Answer:

24/2 = 12

Explanation:

(I'm pretty sure this isn't a Biology question, but I'll answer this because I'm nice.)

To translate English into algebriac equations, we have to understand what the symbols in algebra mean. Here are some we should know:

= : "equal to", "is", "equivalent to", etc.

> : "greater than"

< : "less than"

>= : "greater than or equal to", "at least"

<= : "less than or equal to", "at most"

We also have to know basic math operations:

a + b : "a added to b", "a plus b", "a combined with b", "a more than b", etc.

a - b : "a minus b", "b less than a", "b subtracted from a", etc.

a * b : "a multiplied by b", "a times b", "the product of a and b", etc.

a / b : "the quotient of a and b", "a divided by b", etc.

There are MUCH MORE examples of this, yet it becomes second-nature to change English sentences into algebra.

So, let's tackle the question. Sadly, it's pretty simple, so I won't really go in depth here. Since the quotient of a and b is a/b, the quotient of 24 and 2 is 24/2. We can also say that "is equal to 12" is "= 12". So,

24/2 = 12.

5 0
3 years ago
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