A verb form which ends in -ing, -d, -ed, -n, -en, or -t, and is used as an adjective is called a(n)

i would think its c but i'm not sure

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

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."

tu caminas en las clase de educacion fisica.

its translates: do you walk in in your physical education class?