Question

the presence of a particular group of Bacteria in water bodies indicates contamination identify this group​

Answer 1

Indicator bacteria. Certain bacteria can be used as indicator organisms in particular situations. The presence of bacteria commonly found in human feces, termed coliform bacteria (e.g. E. coli), in surface water is a common indicator of faecal contamination Indicator bacteria are types of bacteria used to detect and estimate the level of fecal contamination of water. They are not dangerous to human health but are used to indicate the presence of a health risk.

Each gram of human feces contains approximately ~100 billion (1x1011) bacteria.These bacteria may include species of pathogenic bacteria, such as Salmonella or Campylobacter, associated with gastroenteritis. In addition, feces may contain pathogenic viruses, protozoa and parasites.

Answer 2

hey mate your answer is coliform bacteria which contaminates the water