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zalisa [80]
3 years ago
8

What are the dated fossils called that help scientists to identify or date rocks or fossils?

Biology
1 answer:
mamaluj [8]3 years ago
5 0

Answer:

Index fossils

Explanation:

The index fossils are the fossils that come in very handy for the geologists when it comes to identifying or dating rock samples or other fossils. The reason for this is that the index fossils have already been dated. They are fossils that are very commonly found, wide dispersed, are easy to be identified, and are limited to only a certain geological period. These characteristics make them an excellent indicator for the dating of the rock layers in which they are found, or the fossils found in the same layers with them, without conducting further examinations.

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cupoosta [38]

Question 1:

Exons are gene fragments whose DNA sequence after transcription is found in mature mRNAs. This part of the gene is most often coding.

The size of the exons in the genomes follows a log-normal distribution, with an average length of about 150 nucleotides, knowing that in eukaryotes, each gene contains several exons and introns (an average of 8) so the size is 8*150 = 1200 bp.

Question 2:

Introns are fragment of a gene located between two exons. Introns are present in immature mRNA and absent in mature mRNA. "Non-coding" fragment of the gene.

The introns average in a gene is 3365 bp including 3'UTR and 5'UTR and intermediate introns.

3 0
3 years ago
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Why must you consume carbohydrates in the foods you eat? How does this relate to cellular respiration?
omeli [17]
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3 years ago
Do viruses carry out all life processes? If not, which are they missing
Molodets [167]

Answer:

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Explanation:

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6 0
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Hope this helped, credits go too google.</span>
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ki77a [65]

Answer:

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3 0
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