Two sister chromatids are held together by the centromere
<h3>The Chromosome</h3>
The chromosome consists of 2 sister chromatids that are linked together by a structure known as the centromere.
Each of the sister chromatids carries an allele of the same gene.
The link between the two sister chromatids is broken at the anaphase stage of the cell division when spindle fibers pull them apart towards opposite poles within the cell.
More on the chromosome can be found here: brainly.com/question/296477
the answer is B.extinction can be related to a failure to adapt to changes in the environment.
I think it would be (from smallest to biggest) this info is from various sources and scientific PDFs
1Glucose=1nanometer
2Protein=10nanometer
3Disaccharides= 200+nanometer
4Starch=1000+nanometer
