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Alchen [17]
3 years ago
15

Why are bones so difficult to break?​

Biology
1 answer:
frozen [14]3 years ago
3 0

Answer:  Calcium and vitamin D are the two most important nutrients for bones. Most cells in your body use calcium to signal various processes. It's also responsible for the strength and hardness of the bones.

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after light excites electrons and they leave Photosystem II to travel down the first electron transport chain. How are these ele
umka2103 [35]

Answer:

Through the photolysis of water molecules

Explanation:

<em>When the electrons in photosystem II gets excited, released and travel down to the electron transport chain, the electrons are replaced by the electron released by the cleavage/photolysis of water.</em>

<em>Water molecule is cleaved resulting in the formation of hydrogen ion, oxygen gas and electrons. The electrons then replace those lost by photosystem II.</em>

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2 years ago
Age-related loss of taste can be due to a(n) __________ number of sensory receptors
ivolga24 [154]
Age-related loss of taste can be due to a decreased number of sensory receptors. 

Good luck :)
7 0
3 years ago
HELP PLEASE! Why might a scientist repeat experiment if she did not make a mistake in the first one
trasher [3.6K]

Answer:

i believe its B but i might be mistaken.

Explanation:

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2 years ago
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Burka [1]

Answer;

-Pure chemical substance and element

Explanation;

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-An element is a pure substance that cannot be broken down into different types of substances by chemical means. All elements are pure substances. An element is composed of a single kind of atom. An atom is the smallest particle of an element that still has all the properties of the element.

-Tungsten is an element and therefore a pure substance.

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2 years ago
Describe how Darwin theory of evolution by natural selection can explain the spread of antibiotics resistant microorganisms like
Sunny_sXe [5.5K]
Darwin's theory of evolution by natural selection can explain how antibiotics are becoming defective because the bacteria that is trying to be fought off might have had a mutation making it more likely to survive. Once that surviving bacteria makes offspring most of the first generation will die from the antibiotic but soon all of their offspring will produce a resistance to that antibiotic. 
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