which sentence or sentences have correct parallel structure? desert animals must develop adaptations that…

which sentence or sentences have correct parallel structure? desert animals must develop adaptations that not only allow them to deal with extreme heat but also help them to cope with a lack of water. desert animals must develop adaptations that allow them not only to deal with extreme heat but also to cope with a lack of water.

which sentence or sentences have correct parallel structure? desert animals must develop adaptations that not only allow them to deal with extreme heat but also help them to cope with a lack of water. desert animals must develop adaptations that allow them not only to deal with extreme heat but also to cope with a lack of water.

Answer

Brief Explanations:

Parallel structure requires balance in grammar. In both sentences, the "not only...but also" construction is used correctly with parallel verb - forms and prepositional phrases. In the first, "allow them to deal" and "help them to cope" are parallel. In the second, "allow them not only to deal" and "but also to cope" are parallel.

Answer:

Both sentences have correct parallel structure.