Which of the following experiments raises ethical concerns?
A. research that releases a poisonous gas into the air
B. research that people have been apart of with their full knowledge and permissions.
C. research that an ethics committee has approved of
D. lab research that uses poisonous chemicals in very small amounts

A. Research that releases a poisonous gas into the air.

Hope this helped!

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.