Answer:
my FBI'd Narayan Rouniyar
The only cause we know of that could shift the spectrum of a source toward longer wavelengths isthe source moving away from us. That's how we interpret the red shift when we see it, and that's where the whole idea of the expanding universe comes from. But ... just like gravity and the Earth going around the sun ... it can't be proved, so it's "only a theory".
87 picograms are equivalent to
grams.
This is a unit problem, in which a <em>derived</em> unit must translated into a <em>fundamental</em> unit. A picogram is a equivalent to <em>a trillionth</em> of a gram, which is the fundamental SI <em>mass</em> unit. Mathematically speaking, we have the following equivalence:

Now we proceed to find the equivalent value for this case:



87 picograms are equivalent to
grams.
To learn more on unit conversions, we kindly invite to check this verified question: brainly.com/question/13016491