Two weeks before her menstrual period, margeret often suffers from PMS. The abbreviation PMS stands for Premenstrual syndrome .
Premenstrual syndrome is a combination of emotional, physical, psychological, and mood disturbances that occur after a woman's ovulation, typically ending with the onset of her menstrual flow. The most common mood related symptoms are irritability, depression, crying, oversensitivity, and mood swings.
<span>Increase in soil erosion. hop it helps.</span>
Producers get their energy from the Sun.
The number of years of divergence from a common ancestor =300,000 years.
<h3>What are mutations?</h3>
Mutations are changes that occur in the DNA of living organisms.
Mutations can be used as molecular clocks if they occur at a constant rate.
Considering the nucleotide substitutions occur by mistake in a segment of ribosomal RNA at a constant rate of one substitution every 100,000 years.
The ribosomal RNA of the two modern-day species have six differences in their sequences.
Number of years of divergence = 6/2 * 100000 = 300,000 years.
In conclusion, changes that occur in nucleotide sequences are known as mutations.
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