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2 years ago

How is modern earth different from earth over four billion years ago

Biology

2 answers:

Viefleur [7K]2 years ago

5 0

Answer:

Earth was not habitable four billion years ago but now it is the only known planet that supports life.

Explanation:

Four billion years old earth was made up of dust and gases. It is claimed by scientists that the sources from which earth was formed included – a) Lunar rocks, b) Meteorites and c) Zircon crystal. The temperature of earth at that time was extremely high such that all the metals with in it were in molten state. Also there was no oxygen in the atmosphere. All these conditions made earth a non habitable planet.

But the present earth is a habitable planet with life on it that is dependent on its resources like air and water. Also the temperature of earth is much supportive to the existence of life on it.

lesya692 [45]2 years ago

3 0

Continents has shifted millions and million years ago

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How do sieve tubes elements group to make sieve tubes

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<em>sieve tube elements are the cells of phloem which allow transportation of photosynthates through phloem...
<u>how sieve tube elements form sieve tubes:
</u>sieve tube elements are connected end to end and form a long chain which is called sieve tube,,,,
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