The analysis of rRNA gene sequences to compare evolutionary relationships is known as O molecular phylogenetic analysis.
O RNA sequence comparison.
molecular evolutionary analysis.
O molecular clock analysis.

O molecular phylogenetic analysis

Explanation:

Molecular phylogenetics can be defined as a type of genetic study whose objective is to determine evolutionary relationships among organisms at the species level or higher (i.e., genera, family, order, etc). This type of analysis is generally represented through a phylogenetic tree showing relationships among taxonomic groups that were the subjects of study, where each branch in the tree represents a particular taxon. RNA ribosomal (rRNA) genes are evolutionary well-conserved and therefore these genetic sequences are often used to make phylogenetic analyses.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: