Answer:
Explanation:
Astronomers use the entire electromagnetic spectrum to observe a variety of things. Radio waves and microwaves – the longest wavelengths and lowest energies of light – are used to peer inside dense interstellar clouds and track the motion of cold, dark gas.
Half-life is<span> the term for the amount of time it takes 50% of an element to decay</span>
The answer is b because it's morphological
