When you use it with a noun. eg
marine park
marine vegetation
marine barometer
you use marine to describe a fish
When writing a sentence
An adjective describes a noun, so when you write that "A dolphin is a marine mammal", you are using "marine" as an adjective. "Marine environment, marine vegetation, marine barometer" are all examples of using "marine" as an adjective.
Referring to the US Marine Corps, the plural noun (properly capitalized) is Marines.
Marine is an adjective (marine life) and a noun (a member of the Marine Corps).
The adjective is 'marine'.
When you are talking about something related to the sea eg marine mammals "Here is the marine forecast......." Today we studied marine vegetation/marine Biology
No. That would be the US Navy.
When you are talking about something related to the sea eg marine mammals "Here is the marine forecast......." Today we studied marine vegetation/marine Biology
Marine is used as an adjective when it is describing something found in or produced by the sea. (Example: marine life, marine plants) Aquatic is of or relating to water. (Example: aquatic sports, aquatic animals, aquatic plants)
In the sentence "Only one of us can play the guitar," there is no adjective phrase. The phrase "only one of us" functions as a noun phrase, where "only" is modifying "one." An adjective phrase typically describes a noun and would include an adjective and its modifiers.
caring