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storchak [24]
2 years ago
10

Physical science semester b exam. HELP PLEASE

Biology
1 answer:
inna [77]2 years ago
4 0

Answer: Where are they at i want to help you but i can't bc there a no qestaions

Explanation:

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Potassium has a half-life of 12 hours. What fraction of a 100g sample is left after 48 hours
EastWind [94]

Answer:

After 48 hours amount left = 6.25 g

Explanation:

Given data:

Half life of potassium = 12 hours

Total mass = 100 g

Mass left after 48 hours = ?

Solution:

Number of half lives passed:

Number of half lives = Time elapsed / half life

Number of half lives = 48 hours/ 12 hours

Number of half lives = 4

At time zero = 100 g

At first half life = 100 g/ 2 = 50 g

At 2nd half life = 50 g/2 = 25 g

At 3rd half life = 25 g/2 = 12.5g

At 4th half life = 12.5 g/2 = 6.25 g

4 0
2 years ago
Thermostats transform thermal energy into mechanical energy.<br> True or false
Vlad1618 [11]

Answer:

False

Explanation:

Hope this helps you :)

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2 years ago
I REALLY NEED HELP PLEASE AND THANK YOU!!! I WILL LOVE YOU FOREVERRR!!!
nasty-shy [4]

Answer: Mitosis is a type of cell division in which one cell (the mother) divides to produce two new cells (the daughters) that are genetically identical to itself. In the context of the cell cycle, mitosis is the part of the division process in which the DNA of the cell's nucleus is split into two equal sets of chromosomes.

The great majority of the cell divisions that happen in your body involve mitosis. During development and growth, mitosis populates an organism’s body with cells, and throughout an organism’s life, it replaces old, worn-out cells with new ones. For single-celled eukaryotes like yeast, mitotic divisions are actually a form of reproduction, adding new individuals to the population.

In all of these cases, the “goal” of mitosis is to make sure that each daughter cell gets a perfect, full set of chromosomes. Cells with too few or too many chromosomes usually don’t function well: they may not survive, or they may even cause cancer. So, when cells undergo mitosis, they don’t just divide their DNA at random and toss it into piles for the two daughter cells. Instead, they split up their duplicated chromosomes in a carefully organized series of steps.

5 0
2 years ago
How does water enter the atmosphere
Alexus [3.1K]
The sun evaporates the water from ponds, oceans...etc. There the water turns into water vapor, a gas. Then it participates from the cloud and restarts all over again.
7 0
2 years ago
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____________ are used to build tissues and perform life functions in many organisms.
Sever21 [200]
The answer is b Nutrients
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3 years ago
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