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sladkih [1.3K]
4 years ago
9

How do geologic timelines help scientists?

Biology
1 answer:
Otrada [13]4 years ago
7 0

Answer:

They used relative dating to divide Earth's past in several chunks of time when similar organisms were on Earth. Later, scientists used absolute dating to determine the actual number of years ago that events happened. The geologic time scale is divided into eons, eras, periods, and epochs.

Explanation:

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Which component of the blood is part of the body’s immune system?
VARVARA [1.3K]
The answer is D, white blood cells.

The main function of white blood cells is to defense the body from bacteria or other pathogens. There's 2 main kinds of white blood cells, lymphocytes and phagocytes. Lymphocytes mainly produce antibodies that can kill bacteria or any pathogens, and phagocytes can ingest the pathogens directly.

Therefore, since the white blood cells can protect our body, they're part of our immune system.
3 0
3 years ago
Read 2 more answers
What membrane activities requires energy from atp hydrolysis?
NikAS [45]

Answer:

active transport, like Na + ions leaving the cell

Explanation:

The active transport requires an energy expenditure to transport the molecule from one side of the membrane to the other, but the active transport is the only one that can transport molecules against a concentration gradient, just as the diffusion facilitated the active transport is limited by the number of transport proteins present.

Two major categories of active, primary and secondary transport are of interest. The primary active transport uses energy (generally obtained from ATP hydrolysis), at the level of the same membrane protein producing a conformational change that results in the transport of a molecule through the protein.

The best known example is the Na + / K + pump. The Na + / K + pump performs a countertransport ("antyport") transports K + into the cell and Na + outside it, at the same time, spending on the ATP process.

The secondary active transport uses energy to establish a gradient across the cell membrane, and then uses that gradient to transport a molecule of interest against its concentration gradient.

8 0
4 years ago
What is the Independent and dependent variable in this experiment?
Oduvanchick [21]

Answer:

The pitch is the independent variable.

The dogs are the dependent variable.

Explanation:

An independent variable is something that you can control such as how high or low the pitch is. The dependent variable is the variable that is dependent on the independent variable. The dependent variable is the one that shows the results.

3 0
3 years ago
What phase of the cell cycle does DNA synthesis occur?
VashaNatasha [74]

Answer:

Interphase

Explanation:

is the only phase that goes through DNA also we are learning the same thing lol

8 0
3 years ago
Why is water crucial for life on Earth?
ICE Princess25 [194]

All life on Earth, at heart use a membrane that separates their organism from its environment. For it to stay alive, the organism takes in important materials for making energy, while also shuttling out toxic substances such as waste products. In this regard, water is essential simply because it's a liquid at Earth-like temperatures.

Hope this helped! :)

6 0
4 years ago
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