From the point of view of the sun, which part of an approaching comet would be the easiest to see?

Which type of microscope would allow the viewer to see ribosomes inside a cell?

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

What effects result when there is an impact between earth and an asteroid? check all that apply. a.massive flooding. b.extinction of many life forms.c.major earthquakes change in average global temperature.d. giant dust cloud