What is the meaning of the word refined as it is used in this sentence from paragraph 4? Sean was a proficient swimmer, not as fast in freestyle as Malik, but he had been training persistently for the competition and had refined his skill through the weeks.

demonstrated

practiced

learned

improved

sis. it's been a while since a read that and had that class so i can't answer for u

yes its b

explanation:

to tese

the krebs cycle and electron transport occur in the mitochondria, though other than that i would need to know more information.

the correct answer is video games and fast food.

hope this (: