Which does a reference point provide select two options
I’ll give you 28pts for who every gets it right

A and E!

Explanation:

The reference focuses are the standard focuses or we can say the root purpose of the chart. In view of the reference focuses, the estimations in the chart in x-hub and y-pivot should be possible. Thus, reference focuses are those which helps in estimating relocation as the beginning stage is constantly considered as the reference point.  

Indeed, even in the greater part of the analyses, standard or reference focuses are kept to keep up the exactness and accuracy of the acquired outcomes. So it can likewise be a standard point for figuring out how to identify an article's movement and speed just as position to quantify removals

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.