Question

Most of the frozen ice in a comet's ____ vaporizes after the comet's many trips around the Sun.
a.
coma
c.
heart
b.
tail
d.
nucleus

Answer 1

it seems to me the correct answer would be nucleous

Answer 2

tail - parts of it broke off a long time ago and then they get heated as they get close to the sun and cooled as they go away.  When this happens many, many times, those pieces finally dissolve away.

Hope this helps