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Mamont248 [21]
3 years ago
8

What do catalyst do in chemical reactions?

Biology
2 answers:
Shtirlitz [24]3 years ago
3 0
Catalyst speeds up the reaction rate of a chemical reaction
AlladinOne [14]3 years ago
3 0
They speed up reactions by lowering the activation energy
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The atmosphere is 80% nitrogen: why do you think plants and animals can't use nitrogen as it is found in the atmosphere?
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Answer: Atmospheric Nitrogen is unreactive

Explanation:

The atmosphere is made up of about 80% Nitrogen, 16% oxygen, about 4% carbon dioxide, rare gases etc.

However, the 80% Nitrogen is highly unreactive, and needs to be trapped by competent micro organisms known as nitrogen-fixing bacteria in the root nodules of legumes.

Then, it is converted to several forms like nitrites, nitrates (easily absorbed by plants), ammonia and finally escape to the atmosphere again.

This brief illustration explains the NITROGEN CYCLE, and it is the only means by which plants and animals can use the highly unreactive nitrogen

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3 years ago
All cells need energy to live. How do the organelles in the plant cell above work together to get and use this energy?
Sloan [31]

Answer:

chloroplast: makes food for plant cells, photosynthesis

mitochondria:produces energy the cell needs to carry out its functions; release energy

vacuole: stores food, water, and waste

lysosome: found mainly in animal cells, digests old cell parts

endoplasmic reticulum: carries proteins and other materials from one part of the cell to the other

cytoplasm: gel -like fluid where the organelles are found

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cell membrane:controls

Explanation:

I'm pretty sure the answer is D based on the info above,and because its the only one that has the correct information about the cell parts

hope its correct

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