The brightest galaxy visible from the Milky Way is the Large Magellanic Cloud. It is one of eleven known dwarf galaxies that orbit
the Milky Way. This galaxy is
in shape and composed of a bar of older red stars, clouds of younger blue stars, and a
bright red star forming region visible near the top of the image seen here.
A)elliptical
B)irregular
C)oval
D)
Spiral

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

actually the answer is c

(nitrogen fixation) will be your answer sorry if im wrong