When writing a sentence
you use marine to describe a fish
When you use it with a noun. eg marine park marine vegetation marine barometer
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.
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
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 an adjective (marine life) and a noun (a member of the Marine Corps).
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)
The adjective is 'marine'.
An adjective describes a noun.
Pale is the word that you would use as an adjective.
vacillating
It is an adjective. To use it as an adverb, you would add -LY (vacantly).