Which best describes a centromere?
a. sister chromosomes that are held together by a chromatid
b. paired chromosomes that have genes arranged in the same order
c. the part of a chromosome that joins the sister chromatids
d. the material that makes up a chromosome

The correct answer is c The part of chromosome that joins the sister chromatid

Explanation:

Centromere is an important part of chromosome that help to join a pair of sister chromatid.Centromere helps the the assemple of kinetochore, the later helps in the segregation of chromosome

          centromere helps in the activity of cohesin protein that helps in the cohesion of sister chromatid after DNA replication.

            According to the positioning of centromere chromosome can be catagorized into 4 types 1  Metacentric chromosome 2 Sub metacentric chromosome 3 Acrocentric chromosome 4 Telocentric chromosome .

one would be wind another would be water density

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation: