A change in direction in a wave when it passes through an opening is called

Refraction

Explanation:

the change in direction of waves that occurs when waves travel from one medium to another. ... Diffraction is the bending of waves around obstacles and openings. The amount of diffraction increases with increasing wavelength

A change in direction in a wave when it passes through an opening is called diffraction.

I hope this helps

i'm assuming that the correct answer is indeed the first one/ "a"..

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.