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Nuetrik [128]
2 years ago
14

What is limestone?**

Biology
2 answers:
yaroslaw [1]2 years ago
8 0

Answer: a hard sedimentary rock, composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.

Nitella [24]2 years ago
7 0
Limestone is a sedimentary rock made of calcium carbonate (CaCO3), composed mainly of calcium carbonate or dolomite, used as building material and in the making of cement.
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Scientists group materials together ________ it is easier to compare and study them that way
o-na [289]

The provided question is incomplete, the correct and complete question is as follows:

Choose the answer that best completes the sentence below.

Scientists group materials together ____________ it is easier to compare and study them that way.

A however

B but

C although

D because

Answer:

The correct answer is - option D because.

Explanation:

Researcher and scientists tries to group material together on their similarities and difference to one another which makes it easier to study and compare various type of materials.

It is the one of major reasons to differentiate materials between groups like liquids state, gases state,  plasma state and solid state materials. One can easily see the difference and comparison is very clear on this type of grouping of materials.

Thus, the correct answer is - option D.

5 0
2 years ago
Elemento vital para todas las especies que habitan el planeta
Ivahew [28]
Oxygen , Carbon , hydrogen
4 0
3 years ago
Some homeostatic imbalances cause a variable that is normally controlled by negative feedback to be abnormally controlled by pos
tigry1 [53]

Answer:

True

Explanation:

Some deviations from normal homeostasis activate the positive feedback loops to control the conditions which are otherwise regulated by negative feedback mechanisms.

For example, the blood levels of respiratory gases and H+ ions are regulated by a negative feedback system via chemoreceptors. The increased partial pressure of carbon dioxide gas and lowered pH or lowered partial pressure of oxygen in the blood are sense by central and peripheral chemoreceptors which in turn activate the neurons of the dorsal respiratory group (DRG).

The activated DRG triggers an increased in the rate and depth of the breathing to facilitate the inhalation of more oxygen and exhalation of CO2 to restore the normal levels.  

However, hypocapnia inactivates the chemoreceptors and does not allow negative feedback to restore the normal CO2 levels in the blood.  

Under such conditions, the positive feedback loop stimulates the DRG neurons more strongly in response to the increased partial pressure of CO2 above the normal levels than when the partial pressure of oxygen falls below the normal level. These dangerously lowered oxygen levels may also cause fainting.  

5 0
3 years ago
6 Which of the following word pairs correctly completes the sentence below? Mechanical waves travel faster through _______ than
gregori [183]
Solids,  liquids. hope that helped
7 0
3 years ago
Read 2 more answers
How are cells able to guarantee that are DNA is always replicated correctly every time? 
KIM [24]
Because if it’s sexual it has to have both parnets dna and if it’s asexual it has to have one parents dna
4 0
3 years ago
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