The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

Options

A. Cyanobacteria
B. Archaebacteria
C. Chemosynthetic autotrophs
D. Heterotrophic bacteria

Answer

D

Explanation

Heterotrophic bacteria are those that do not prepare their own food and depend on others for their survival. Many bacteria like lactobacillus helps in the production of curd from milk.