When does a comet's bright tail appear?

a.
when it nears the moon

b.
when it nears another comet

c.
when it collides with a planet

d.
when it nears the sun

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kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above