Which of the following groups exhibits the most extensive nutritional diversity?

Which disease is caused by mycoplasma?

Nostoc is a

Which of the following important features are found in blue-green algae?

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

Refer to the given figures of a bacterial cell and Nostoc and choose the option which shows the correct labels for the structures marked as $A$,$B$,$C$,$D$,and $E$.