Star formation begins when a.
gas and dust collapse inward.
c.
the fusion of hydrogen slows down.
b.
nuclear fusion starts in the core.
d.
the core becomes carbon and oxygen.

Please select the best answer from the choices provided
(Space and Environment)

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves