Primitive bacteria living in salty areas are called as

When $cocci$ bacteria are present in a bunch or cluster,they are called:

What are organisms that obtain energy from reduced inorganic compounds called?

In which of the following organisms is the cell wall absent in their cells?

In which of the following organisms are hormones normally absent?

Most living organisms cannot survive at temperatures above $45\,^{\circ}C$. How are some microbes able to live in habitats with temperatures exceeding $100\,^{\circ}C$?