The eye symbol represents which of the following hazards?
laser hazard
chemical hazard
biohazard
eye and face hazard

The eye symbol represents eye and face hazard.

Explanation:

The eye symbol represents the presence of chemicals or radiations at working place which can affect your eyesight and facial tissues. So, the symbol meant to use black goggles and face mask to protect eyes and facial tissues.

Hazards which means danger or problems occurring in work place or area due to chemicals. The chemicals and radiations can cause various hazards if proper protection were not taken.

So, all laboratories performing operations with these kinds of hazardous radiations must have symbols representing the kinds of hazards.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).