Your friend says scientific theories cannot be believed because they are always changing. wwhat can you say to counter the argument?

scientific theories are mostly approved after they have been researched fully and can be backed up with evidence.

Explanation:It is less unlikely that the theory will change except that it can be improved when the new evidence is discovered due to the fact that they are based on discovered evidence.

Theory of gravity for example there is a proven evidence that there is a pulling force knows as the force of gravity that keeps us from floating on earth whereas in space the lack of that force causes one to float this is backed up by evidence that are visible and can be tested all over again.

None of the teachers stays at school past 5:30.

Explanation:

The subject used here is ‘stays’. This is so because it is the simple subject which fits perfectly in the sentence and illustrates its meaning. The contrary word ‘stay’ is not used because it does not gives the right meaning to the sentence. Stays is the plural form of stay and here the reference is done to multiple teachers, thus stay is not used here.