4.stars on the upper left end of the main sequence differ from those on the lower right end in what way?

a. stars on the upper left end are less massive.
b. stars on the upper left end are more massive.
c. stars on the upper left end tend to be red in color.
d. stars on the upper left end are near the end of their life cycle.

15 points need quick 1. looking at your graph and the geologic time scale during what period did this rock form? what is the age span of the rock, in millions of years? 2. this rock sample is limestone and shale. with what you know about rock formation, what type of environment did these organisms live in? 3. if some of these fossil samples were found in a rock also containing leaf fossils, could you use radiocarbon dating to determine the age of this rock? explain.