LIFE SCIENCE

Detailed explanation-1: -The Eubacteria are an ancient and diverse group. Different species have evolved to fit in every type of environment and lifestyle. They are often classified by their oxygen requirements and by the type of nutrition in which they engage.

Detailed explanation-2: -Examples: Anabaena, Salmonella, and Lactobacillus.

Detailed explanation-3: -Gammaproteobacteria are the largest and the most diverse group of Proteobacteria. Many are human pathogens that are aerobes or facultative anaerobes. Some Gammaproteobacteria are enteric bacteria that may be coliform or noncoliform.

Detailed explanation-4: -Eubacteria are prokaryotic microorganisms consisting of a single cell lacking a nucleus and containing DNA is a single circular chromosome. Eubacteria can be either gram-negative or gram-positive, they have economic, agricultural, and medical importance. They include E. coli, Lactobacilli, and Azospirillum.