Question

what are the three main pieces of evidence that support the big bang theory? * 1 point
red shift, cmb, and the electromagnetic spectrum
red shift, cmb, and the abundance of light elements in the universe
red shift, the abundance of elements in the universe, and singularity
cmb, the abundance of elements in the universe, and the collision theory
how does the evidence
ed shift\ get its name? * 1 point
when we analyze the light spectra of stars and it has been red shifted, it means the star has gotten farther away from us
on the visible light spectrum, red has the longest wavelength meaning that it has the lowest frequency
when an object is moving away from us, the wavelengths related to that object lengthen
all of the above

Explanation:

First Question:

The three main evidences for Big Bang Theory are red shift (shows universe expansion), CMB (cosmic microwave background, leftover radiation), and abundance of light elements (like H, He, consistent with Big Bang nucleosynthesis). Other options have incorrect components (electromagnetic spectrum, singularity, collision theory are not main evidences here).

Red shift name comes from: red has longest visible wavelength (lowest frequency), when objects move away, wavelengths lengthen (shift to red end), and analyzing star spectra with red shift shows distance. So all statements explain the name.

Answer:

B. Red shift, CMB, and the abundance of light elements in the universe

Second Question: