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Kay [80]
2 years ago
14

How many years did the precambrain era span

Biology
1 answer:
Vlad1618 [11]2 years ago
5 0

Answer:

Explanation:

It is estimated that the Precambrian Era lasted between 3.9 and 4 billion years. Many scientists believe that this era accounts for 90 percent of the world's history.

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Who carried out a series of experiments on frogs in the 1780s?
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Luigi Galvani I believe???

Explanation:

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True or false: surveillance can be performed through either stationary or mobile means.
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denpristay [2]

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<span>Empirical evidence, data or knowledge is an obtained set of facts or figures or existing and presenting data that was yielded during the process of experimentation or scientific discovery. These empirical data or evidence is further studied and investigated by the scientist in a formal scientific approach which follows the steps of observation, making a hypothesis, gathering data, interpreting data and evaluating the data. These steps of the scientific approach are vital in the course to explain and discuss the result and evidence obtained during the process. </span>


4 0
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