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zimovet [89]
2 years ago
5

How much of the organisms that lived on Earth do scientists believe are represented by the fossil record?

Biology
1 answer:
Nimfa-mama [501]2 years ago
8 0

Answer:

2%

Explanation:

The scientist believe that around 2% of the species that existed on Earth have been preserved in the fossil records. It is still a hot debate about it though, as there are only around 250,000 species identified in the fossil records so far, which is less than a quarter from the species that live in the present.

The reason why scientists believe that the majority of the species have not been preserved are very logical though. One of the reasons is that lot of species existed very long time ago, so their remains just didn't lasted so long. Other reason is the movement of the plates, where we have situation where plates that existed in the past have been totally suducted and melted in the mantle, while others are at the verge of it, so every fossil with them is melted and destroyed too. Another reason is that lot of species do not have hard parts, solid bone structure, so their preservation has been pretty much impossible,

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In the beginning of the meiosis process, when genes are present in the same chromosomes but very far, they undergo indepedent assort due to homologous recombination and the random exchnage of matching fragment in  homologous chromosomes takes place. During the crossing over there are very less chances that all types of gametes are produced accurate frequency.

Hence, the correct answer is 4.

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