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Fofino [41]
3 years ago
8

Please help with this question I am so confused!​

Biology
1 answer:
Angelina_Jolie [31]3 years ago
6 0

Answer:

prokaryotic cells only

Explanation:

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If you consumed 1500 kcals, of which 900 were from carbohydrates, what percent of your total kcals comes from the carbohydrates?
Andrei [34K]
1500 =100
900 =x
900 x 100 = 90000/1500= 60

60% of kcals come from carbs
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How does carbon-14 dating work?
Nitella [24]

Answer:

Plants and animals assimilate carbon-14 from carbon dioxide throughout their life. When they die, they stop exchanging carbon with the biosphere and their carbon-14 content begins to decrease at a rate determined by the law of radioactive decay.

Radiocarbon dating is basically a method designed to measure residual radioactivity.

Explanation:

Carbon-14 is a weakly radioactive carbon isotope; It is also known as radiocarbon, and is an isotopic stopwatch.

Radiocarbon dating is only applicable to organic materials and some inorganic materials (not applicable to metals).

Proportional gas counting, liquid scintillation counting, and accelerator mass spectrometry are the three main methods of radiocarbon dating.

The radiocarbon, or carbon-14, is an isotope of the carbon element that is unstable and weakly radioactive. The stable isotopes are carbon-12 and carbon-13.

Carbon 14 is continuously formed in the upper atmosphere by the effect of cosmic ray neutrons on nitrogen-14 atoms, rapidly oxidizing in the air to form carbon dioxide and entering the global carbon cycle.

Accelerator mass spectrometry (AMS) is a modern method of radiocarbon dating that is considered the most efficient way to measure the radiocarbon content of a sample. In this method, the content of carbon-14 is measured directly in relation to carbon-12 and carbon-13 present. The method does not take into account beta particles, but the number of carbon atoms present in the sample and the proportion of the isotopes.

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Which layer of soil is the most newly formed? A. subsoil B. humus C. topsoil D. bedrock
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subsoil is newly formed hope this helps

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