Answer:
Galaxies are basically billions and billions of stars, gas, and dust packed together which forms a galaxy. The phrase that best defines a galaxy is "large collection of stars, gas, and dust held together by gravity"
Explanation:
Answer:
The chromatin structure undergoes various modification for proper gene expression. Histone acetylation, histone deacetylation, methylation and sumoylation are important for the epigenetics.
Epigenetics may be defined as the change in the genome that affect gene activity, its expression and heritable phenotypic change of the organisms. The DNA sequence is not altered in the epigenetic modification but the gene expression has been modified by methylation or acetylation.
Answer:
charts that show population increase or decrease.
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the internet is also one like the san diego zoo has a page where you can see if the animal is flourishing in numbers, or not.