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Natasha2012 [34]
3 years ago
15

15.

Biology
1 answer:
sattari [20]3 years ago
5 0

Answer:

The Sun's rays are trapped by the atmosphere, keeping temperatures high for most of the year.Explanation:

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The cell in the bone marrow that gives rise to all other blood cell types is the ________.
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Answer:

Hematopoietic  stem cells

Explanation:

These hematopoietic stem cells gives rise to the other blood cells in the bone marrow and the process is known as hematopoiesis. It occurs in the red bone marrow.

Bone marrow is the place where new blood cells are produced. It is the tissue comprising center of large bones and contains two types of stem cells: hematopoietic and stromal.

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Ectotherms change their temperature by modifying their behavior
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The carbon atom is tetravalent; this means that __________. ANSWER the bond angle between each bond is 90°, forming an arrangeme
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Answer:

The correct option is: A carbon atom can complete its valence shell by forming four covalent bonds

Explanation:

Carbon is a chemical element that belongs to the group 14 of the periodic table. The atomic number of carbon atom is 6 and it is denoted by the chemical symbol C.

The electronic configuration of carbon is: 1s², 2s², 2p².  

Therefore, there are 2 electrons in the first electronic shell and 4 electrons in the second electronic shell of the carbon atom.  

<u>There are </u><u>four valence electrons </u><u>in a carbon atom and thus it can form four covalent bonds to complete its valence shell. Therefore, carbon atom is tetravalent.</u>

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4 years ago
When a virus invades a host the most common threat is
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Destruction of cells by viral reproduction.

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What occurs during the process of gas exchange?
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During gas exchange oxygen moves from the lungs to the bloodstream. At the same time carbon dioxide passes from the blood to the lungs.

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