In our science class we have a question to answer, which is 'explain how redshift supports the idea of an expanding universe'.
I am not sure how to answer this question, as I know that there are 'different types' of redshifts. The one we (my class) were focusing on for this topic was the Doppeler effect. We were told that the galaxies were moving away from us, so that causes the light to shift. I have explained it like this in the past and have gotten it correct, however, I also know that on a scale so large, that space itself expansing is causing the redshift. So I am not sure how I should answer this question because I feel like the teacher is asking us to explain the doppeler effect, not cosmological redshift. So if I explain it using the Doppeler effect example, would the answer generally be incorrect because it is cosmological redshift that supports an expanding universe?