Which causes strep throat, anthrax, and tetanus?

fungi

viruses

bacteria

protists

The best answer is bacteria.

Sore throat caused by a bacteria called streptococcus pyogens. It is spread or transmitted when a person inhales tiny fluid droplets suspended in the air from the cough or sneeze of an infected person.

Anthrax is caused by a bacteria known as bacillus anthracis. Anthrax is transmitted through handling animal products such as wool and hides that have been contaminated by the spores of the bacteria. It is also acquired by ingesting infected meat that has been poorly cooked.

Tetanus is caused by a bacteria called clostridium tetani which resides in soil. It gets access to the body through broken skin when a person is cut or pierced by e. g. a rusty sharp object contaminated with the bacteria.