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gizmo_the_mogwai [7]
3 years ago
5

Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydr

ogen atoms. Carbon and hydrogen chemically combine to form methane (CH4).
Based on this information,
A.
methane is an element and carbon and hydrogen are compounds.
B.
carbon, hydrogen, and methane are all elements.
C.
carbon, hydrogen, and methane are all compounds.
D.
carbon and hydrogen are elements and methane is a compound.
Biology
1 answer:
Luden [163]3 years ago
8 0

Answer:

the answer is D look at your periodic table for more understanding

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rewona [7]

The circulatory and skeletal systems work together in the following way: skeletal system produces cells in the bone marrow while the circulatory system transports cells where they need to go (option A).

<h3>What is skeletal and circulatory system?</h3>

Skeletal system is the system that works as a support structure for your body. It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals.

Circulatory system, on the other hand, are parts of an animal body comprising the heart, veins, capillaries and arteries. It circulates blood and lymph through the body.

According to the above description of both systems, the skeletal system produces blood cells in the bone marrow while the circulatory system transports these cells.

Learn more about skeletal system at: brainly.com/question/1283837

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4 0
2 years ago
The rate and direction of reactions are greatly influenced by
zlopas [31]

Answer:

reactions

Explanation:

Reactions occur when two reactant molecules effectively collide, each having minimum energy and correct orientation. Reactant concentration, the physical state of the reactants, and surface area, temperature, and the presence of a catalyst are the four main factors that affect reaction rate.

3 0
3 years ago
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zzz [600]
The answer would be letter a
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What is the cell membrane
geniusboy [140]

Answer:

its a noun

the semipermeable membrane surrounding the cytoplasm of a cell.

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What is the principle of size exclusion chromatography?​
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hope it helped

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