In which sentence is the underlined word a present participle? it is exciting to see the raised head of a dolphin in the water! when dolphins are above the water, they are breathing air. having adapted to pressure changes, dolphins’ lungs enable them to dive below the ocean’s surface. swimming dolphins need to break the surface for air every two minutes.

A present participle is formed with the stem of the workd and the suffix -ing and it can have many functions, such as adjective, a part of the verb phrase. 

Here all the stentences have a present participle! Here they are:

It is exciting to see the raised head of a dolphin in the water!
exciting - it can be seen as a present participle or adjective

 When dolphins are above the water, they are breathing air.
breathing - this is definitely a present participle

 Having adapted to pressure changes, dolphins’ lungs enable them to dive below the ocean’s surface.
 here "having" is the participle"

Swimming dolphins need to break the surface for air every two minutes.

here "smimming" is the participle.

So the answer depends on which word was underlined!

He said he had no intention to be involved with any other suspects and that the incident occurred at a news conference 9in in the parking area and was also expected for an hour later and a few days before his arrest and he had a 7child and the two had been killed and two were injured in a c car 33crash incident in a c square on the scene in which the driver of the car parked on a bus at a bus stop in a coma and was also a suspect on a car crash near san jose on the interstate north on a highway from san diego county in new orleans where a woman is being charged in connection with the murder in her home state in a coma