LIFE SCIENCE

Detailed explanation-1: -Ribosomal RNA sequences differ between species, due to mutation. Through variation in rRNA sequences we can distinguish organisms on approximately the species level and trace evolutionary relationships. Study of ribosomal RNA led to the definition of three separate “Domains” of life; Eukaryotes, Bacteria, and Archaea.

Detailed explanation-2: -How are evolutionary relationships determined? The relationships of multiple species are recorded on phylogenetic trees. If two or more species are recorded above the same split in a phylogenetic tree, or node, then they are related to each other, however distantly.

Detailed explanation-3: -Scientists use a tool called a phylogenetic tree to show the evolutionary pathways and connections among organisms. A phylogenetic tree is a diagram used to reflect evolutionary relationships among organisms or groups of organisms.