What is the best evidence for a three-domain system?

The best evidence for the three domain system is

Sensitivity to Antibiotics

Explanation:

The three domains of life includes :

Archaea - oldest known domain, ancient forms of bacteria.

Bacteria - all other bacteria that are not included in the Archaea domain.

Eukarya - all the organisms that are eukaryotic or contain membrane-bound organelles and nuclei.

Types of evidences for the three domain system are:

1) differences in the sequences of nucleotides in the cell's robosomal RNAs (rRNA)

2) the cells's membrane lipid structure.

3) its sensitivity to antibiotics.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.