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Scilla [17]
3 years ago
9

1) What happened around 10,000 years ago that changed the way many humans live?

Chemistry
2 answers:
ziro4ka [17]3 years ago
6 0

Answer:

c

Explanation:

hope everything is good!!

love history [14]3 years ago
3 0
The answer is C

Hope it helps ;)
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Define atmpospheric pressure
krok68 [10]

Answer:

that pressure is called atmospheric pressure or air pressure. It is the force exerted on a surface by the air above is as gravity pulls it to earth. atmospheric pressure is commonly measured with a barometer. In a barometer , a column of mercury is a glass tube rises ot falls as the weight of the atmospheric changes

5 0
3 years ago
Which of the following represents a phase change? A. Melting B. Crushing C. Expanding D. Burning
Fantom [35]
Melting is an example of phase change
6 0
3 years ago
101.325 kPa = 760 mmHg. So, 25.0 kPa is
gogolik [260]
101.325 kPa = 760 mmHg.
So, 25.0 kPa is 187.515 mmHg
5 0
3 years ago
A sperm cell from a male cat contains 19 chromosomes. When it reproduces with a female cat, how many chromosomes in total will a
Ilya [14]

Answer:

38

Explanation:

19

it is impossible that there is only sperm .egg must be present from female

38

19 from male and 19 from female

it is correct

76

dog has 76 chromosomes

if cat has it will be abnormal due to unequal chromosome

152

also not possible

3 0
3 years ago
In the reaction: CH3COO-+NH4+----------CH3COOH+NH3 what is the reactant acid and its conjugate base?
WINSTONCH [101]

Answer : The reactant acid and conjugate base in this reaction is, NH_4^ and NH_3.

Explanation :

Conjugate acid : A species that is formed by receiving of a proton (H^+) by a base is known as conjugate acid.

Conjugate base : A species that is formed by donating of a proton by an acid is known as conjugate base.

The given chemical reaction is,

CH_3COO^-+NH_4^+\rightleftharpoons CH_3COOH+NH_3

In this reaction, CH_3COO^-(base) react with NH_4^(acid) to give CH_3COOH(conjugate acid) and NH_3(conjugate base).

Therefore, the reactant acid and conjugate base in this reaction is, NH_4^ and NH_3.

8 0
3 years ago
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