Which of the following could be a biological hazard? a. pesticide b. fish bone c. hepatitis a d. sanitizer

A biological hazard is defined as any biological substance that threatens or may bring harm to the health of a living organism. Such includes virus or toxin samples and medical waste. Based on the given question above, the option that could be a biological hazard is option A. Pesticide. 

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.