What's the main role of the backbone in a vertebrate? a. It helps protect our body from becoming damaged.
b. It makes it harder to stretch and move.
c. It helps our muscles to become stronger.
d. It helps some species like humans to survive​

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ich statement best shows a problem in travels with charley?

one sharp difficulty presented itself. in the intervening twenty-five years my name had become reasonably well known.

this being so, my trip demanded that i leave my name and my identity at home.

i had to go alone and i had to be self-contained, a kind of casual turtle carrying his house on his back.

with all this in mind i wrote to the head office of a great corporation which manufactures trucks.

not sure maybe the subject closer to it or subject-verb agreement