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shtirl [24]
3 years ago
8

Which best helps scientists determine the age of fossil

Biology
1 answer:
Scrat [10]3 years ago
7 0

Explanation:

To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.

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Select all of the following that are true about rain that falls on deserts:
lakkis [162]

I think it's the first and second option but I could be wrong because I don't know much about deserts :)

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3 years ago
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What is puberty for boys?
Mashutka [201]

When boys go through puberty their voices change and they start to grow hair on different area of their body such as their chest, face and pubic area. Also they will start to get acne

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Calculate the molarity of 0.75 L of a solution containing 0.83 g of dissolved KCI. A 0.015 M B 0.75 M C 1.1 M D 6.2​
marissa [1.9K]

Answer:

A 0.015M

Explanation:

Molarity, which refers to the molar concentration of a solution, can be calculated using the formula:

Molarity (M) = mole (n) / volume (L)

Based on the information provided in this question, the solution contains 0.83 g of dissolved KCI.

We can calculate the number of moles of KCl in the solution by using the formula:

Mole = mass ÷ molar mass

Where atomic mass of; K = 39, Cl = 35.5

Molar Mass of KCl = 39 + 35.5

= 74.5g/mol.

Mole = 0.83g/74.5g/mol.

mole = 0.01114

Approximately, n = 0.011mol

Hence, molarity = 0.011mol/0.75L

Molarity = 0.0146

Molarity = 0.015M

8 0
3 years ago
Case Ico-delete Highlights
Zolol [24]

Answer:

The correct answer would be - polycystic kidney disease.

Explanation:

The given clinical picture or information suggests that it is most probably an infection that takes place in one or both the kidneys and leads to the setting of polycystic kidney disease.

The given symptoms such as abdominal or flank pain, recurrent UTIs, blood in the urine, and hypertension are characteristic symptoms of polycystic kidney disease. Cystic lesions found on abdominal ultrasound are a confirmation of the disorder.

The key disease of this polycystic disorder is Goodpasture syndrome which shows symptoms of both glomerulonephritis and pulmonary hemorrhages, and medullary sponge kidney disorder.

5 0
3 years ago
A student put the powder to the corom board . Sciencetific reason for adding powder is ,
kondaur [170]

Answer:

B or D

Explanation:

think of it how you use chalk on a chalk board, its less friction using chalk instead lets say a marker on a white board.

8 0
3 years ago
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