Question

No system is completely closed off from its surroundings, but some systems are almost completely closed.

Which represents a system that is almost completely closed?

A.
the bird exhibit at the zoo

B.
a tropical fish aquarium

C.
the tropical rainforest exhibit at the botanical gardens

D.
the African Safari Park

@iGreen

Answer 1

I think B

Answer 2

Yea I would go with B

Answer 3

Thank you