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LenKa [72]
3 years ago
15

50 POINTS!!!!!!!!!!!

Chemistry
2 answers:
Pani-rosa [81]3 years ago
6 0

Answer:

c

Explanation:

kifflom [539]3 years ago
5 0
A substitution is a mutation that exchanges one base for another. This can include a change in a single chemical letter. ex. changing a to g or in your case g to a. I believe the correct answer should be B.
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Please help thank you
Fynjy0 [20]

Answer:

D

Explanation:

8 0
3 years ago
We heavier the object the less friction that exist is this true or false
EastWind [94]
I think the answer is false because there is more friction
4 0
3 years ago
A machine have 75% efficiency,what does it mean.​
Kazeer [188]

Answer:

A machine have 75% efficiency means 25% of efficiency has been lost due to friction and a machine can work 75% only.

8 0
3 years ago
Two substances, A and Z, are to be identified. Substance A can not be broken down by a chemical change. Substance Z can be broke
Kisachek [45]

Answer;

(3) Substance A is an element and substance Z is a compound.

Explanation;

-A compound is a substance formed when two or more chemical elements are chemically bonded together, such as water, carbon dioxide, methane, etc while an element is a pure chemical substance made of same type of atoms, such includes, oxygen, potassium, hydrogen, carbon, etc.

- Compounds can be broken down or decomposed into simpler substances: elements cannot be broken down chemically into simpler substances .

5 0
3 years ago
Read 2 more answers
What approximate percentage of the Earth’s freshwater is groundwater?
grigory [225]

the answer is c.) 30%

4 0
3 years ago
Read 2 more answers
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