Which of the following is the best example of an open system?
A. The moon
B. A vacuum bottle
c. An anthill
D. A sealed box

A) An Anthill.

It is this because an anthill hill is considered a flow system housing organization work. AKA, the way the worker ants go about their work and the systems in which they do that.

hope this helps!

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.