NEET BIOLOGY

Detailed explanation-1: -Basically, it comes down to the fact that evolution happens a lot faster for bacteria than it does for us. Bacteria have two advantages that allow them to evolve quickly. One is that they grow really fast. The other is that they can share DNA with each other, even between species.

Detailed explanation-2: -Evolutionary biologists generally agree that humans and other living species are descended from bacterialike ancestors. But before about two billion years ago, human ancestors branched off. This new group, called eukaryotes, also gave rise to other animals, plants, fungi and protozoans.

Detailed explanation-3: -Bacterial species evolve quickly both because their huge populations offer many opportunities for mutations, and because they readily exchange genetic information, even between species. Some of this genetic heterogeneity influences drug sensitivity or resistance, and thereby provides fodder for Darwinian selection.

Detailed explanation-4: -It is likely that eukaryotic cells, of which humans are made, evolved from bacteria about two billion years ago. One theory is that eukaryotic cells evolved via a symbiotic relationship between two independent prokaryotic bacteria.