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kondor19780726 [428]
3 years ago
8

the british naturalist charles darwin developed a theory after observing species in the galapagos islands. what is the name of t

his theory?
Geography
1 answer:
Softa [21]3 years ago
8 0
From research I think the theory is ‘Island Rule’ but what I know is that he realized that on isolated islands the sizes of animals would differ from their mainland relatives. This is because of the scarcity of foods on islands or the lack of predators
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A radioactive element has a half-life of 1,000 years. If a sample of this element begins with a mass of 20 grams, how long would
Fynjy0 [20]

A radioactive element with a half-life of 1,000 years, and starting mass of 20 grams, will need 2,000 years to decrease to 5 grams.

Explanation:

The radioactive elements all have a specific half-life. Each element's half-life is well known, and they are used by scientists of numerous fields as they are excellent for determining the age of a particular item, be it or organic or non-organic nature. In this case, we have a radioactive element with a half-life of 1,000 years, and starting mass of 20 grams.

The half-life basically means that half of the mass of an element is lost during a particular period of time. For the element in question we need to find out how much time will be needed for it to decrease to 5 grams. In order to get to the result, we just need to add 1,000 years on every decrease of half of the mass:

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So in 1,000 years, the element in question will decrease to 10 grams, and in further 1,000 years (2,000 cumulatively) it will decrease to 5 grams.

Learn more about radioactive decay brainly.com/question/9796067

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