What are a comet's nucleus and inner part of the coma collectively referred to as?
A. the comet's brain
B. the comet's tail
C. the comet's coma
D. the comet's head
Answer: D. the comet's head
What are a comet's nucleus and inner part of the coma collectively referred to as?
A. the comet's brain
B. the comet's tail
C. the comet's coma
D. the comet's head
Answer: D. the comet's head