The goal of the national park service is to conserve natural scenery and wildlife.

which phrase is the infinitive phrase in the sentence?

"to conserve"

Explanation:

An infinitive phrase is "to" + the following verb. In this case, "The goal of the National Park Service is TO CONSERVE national scenery and wildlife."

If you were to say "Sandra is here to study for her English test", the infinitive phrase would be TO STUDY.

Hope this helps :)

"the day we found the sharks' teeth" i would say highlight the element of the plot as it sets its boundaries and centers the adventures of them being on a boat and cleaning spit of sand.