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Inessa05 [86]
3 years ago
6

Biology unit test 4 9th grade

Biology
1 answer:
adoni [48]3 years ago
8 0
Which one? the clssifying matter or the ionic bonds?
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Pls answer fast thx.
sdas [7]

the answer is b............            

6 0
3 years ago
7. During osmosis A) Pure solvent diffuses through a membrane, but solutes do not. B) Pure solutes diffuse through a membrane, b
MrRissso [65]

Answer: Option A.

Pure solvent diffused through a membrane but solutes do not.

Explanation:

Osmosis is process where solvents or molecules move from a region of low solute concentration to a region of high solute concentration through a semipermeable membrane which tend to balance the concentration of solutes. Osmosis is passive transport i.e it does not require energy for movement.

3 0
3 years ago
The atmosphere is 80% nitrogen: why do you think plants and animals can't use nitrogen as it is found in the atmosphere?
Setler [38]

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

3 0
3 years ago
Read 2 more answers
When you exhale, or breathe out, the process happens in reverse. The diaphragm, which had contracted and moved down, now relaxes
gogolik [260]
I think It would be A
5 0
3 years ago
Read 2 more answers
HELP PLEASE:
murzikaleks [220]

Answer:

Pinocytosis is one type of endocytosis, the general process by which cells engulf external substances, gathering them into special membrane-bound vesicles.

Explanation:

Hope that helped!

3 0
2 years ago
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