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Naya [18.7K]
2 years ago
7

20 Which of these statements about plants are true?

Chemistry
1 answer:
solong [7]2 years ago
6 0

Answer:

C) 2 and 4 only

Explanation:

plants are the producers in a food chain

plants use sunlight for photosynthesis

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Uranium, an important component of both nuclear weapons and nuclearreactors, has two major isotopes, U-238, which has a half-lif
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Answer:

Hello your question is poorly written below is the well written question

Uranium, an important component of both nuclear weapons and nuclear reactors, has two major isotopes, U-238, which has a half-life of  approximately 4.5 billion years, and U-235, which has a half-life of approximately 700 million years. Both were present in equal amounts at the time of the creation of the Earth, 4.5  billion years ago. How many years after the creation of the Earth had the amount of radiation from uranium decayed to half the amount present at the time of the creation of the Earth

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Explanation:

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U-238   h1/2 = 4.5 billion years

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we know that N = No ( 1/2 )^h   where h = time / half-life time

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