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klemol [59]
4 years ago
13

When during the cell cycle do chromosomes first become visible

Biology
1 answer:
Andrei [34K]4 years ago
3 0
The chromosomes become visible when they hit the mitosis stage in the cell cycle.

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Which of the following is true of ecological succession? Pioneer organisms move into new communities first. Primary productivity
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The answer is A.

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3 years ago
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Embryonic stem cells are undifferentiated cells. They can grow and divide giving rise to any type of tissue in a developing embr
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Stem cells cut and repair their own DNA to promote formation of new tissues.

Explanation:

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Snezhnost [94]

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3 0
3 years ago
If a radioactive nuclide has a half-life of 1.3 billion years and it is determined that a rock contains 25% of its original amou
shtirl [24]
A=P(1/2)^(t/h)
A=final amount
P=initial amount
t=time
h=half life


so
h=1.3 billlion (just write 1.3 and remember to mulipy the end time by 1 billion)

and final amount is 25% of original or 0.25P
0.25P=P(1/2)^(t/1.3)
divide both sides by P
0.25=(1/2)^(t/1.3)
take ln of bot sides
ln(0.25)=ln((1/2)^(t/1.3))
property of logarithms
ln(0.25)=(t/1.3)ln(1/2)
divide both sides by ln(1/2)
(ln(0.25))/(ln(1/2))=t/1.3
times both sides by 1.3
(1.3ln(0.25))/(ln(1/2))=t
remember that this is billion so
(1,300,000,000ln(0.25))/(ln(1/2))=t
2600000000.0001=t
about 2.6 billion years
6 0
4 years ago
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Reptile [31]
The answer would be Food being digested in the stomach. Homeostasis is the process the body does to regulate bodily functions.
6 0
4 years ago
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