HORTICULTURE

Detailed explanation-1: -Bacteria are tiny, single-celled organisms that get nutrients from their environments. Some bacteria are good for our bodies-they help keep the digestive system in working order and keep harmful bacteria from moving in. Some bacteria are used to make medicines and vaccines.

Detailed explanation-2: -The agents that cause disease fall into five groups: viruses, bacteria, fungi, protozoa, and helminths (worms). Protozoa and worms are usually grouped together as parasites, and are the subject of the discipline of parasitology, whereas viruses, bacteria, and fungi are the subject of microbiology.