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Galina-37 [17]
3 years ago
12

How have mass extinctions helped scientists develop the geologic time scale

Biology
1 answer:
sladkih [1.3K]3 years ago
8 0

Scientists developed the time scale by studying rock layers and fossils world wide.
Radioactive dating helped determine the absolute divisions in the time scale. so mass extinction help because there is more to study
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Which of the following events characterizes metaphase of mitosis?
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A.chromosomes aligning themselves at the equator.

<h3>What distinguishing features of mitosis' metaphase?</h3>

A phase of cell division known as "metaphase" (mitosis or meiosis).Individual chromosomes are typically dispersed throughout the cell nucleus.The chromosomes of the cell condense and move toward one another, aligning in the center of the dividing cell, and the nucleus of the cell disintegrates during metaphase.

<h3>What distinguishes metaphase from other phases?</h3>

Its alignment of a duplicated chromosomes at the metaphase plate, an equatorial plate, is what gives metaphase its name.Via microtubules attached to its kinetochore, one of the sister chromatids is joined to one pole of the cell, and the other sister chromatid is associated to the other pole.

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How is wind energy a renewable source ?​
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Silicon dioxide forms the cell walls of _____. <br> diatoms<br> insects<br> plants
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Answer:

Explanation:

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2. Primases are the enzymes helps in the synthesis of short RNA sequences used as primers in replication. Non functional primase leads to no primer synthesis.  

3. DNA Polymerase is an enzyme helps in the addition of new nucleotide to the growing strand in replication. Non functional DNA polymerase prevents the strand growing as no new nucleotides were added.  

4. Helicases are the enzymes helps in the separation of double strands into single and helps in each strand to be copied. Non functional helicase leads to prevention of unwinding of strands and replication inhibition.  

5. ligase is an enzyme that joins nicks(small gaps) in the DNA strand by creating ester bond. Non functional ligase leads to unjointed gaps of lagging strand.  

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