An annual is a plant that completes its life cycle, from seed to bloom and back to seed again all in a single growing season.
(An annual; is back; a plant that completes its life cycle, from seed to bloom and) (a plant that completes its life cycle, from seed; to bloom; )
An annual a plant that completes its life cycle, from seed
is back to bloom
a plant that completes its life cycle, from seed to bloom and