yes
a dependent clause that modifies a noun
Anything that modifies a noun is an adjective even if it is also a subordinate clause.
It modifies a verb, adjective, or an adverb.
An adverb clause is a subordinate clause that modifies a verb, adjective, or adverb. A conjunction that begins an adverb clause is called a subordinating conjunction. It joins the clause to the rest of the sentence.
An adjective modifies a noun or a pronoun. (it can also modify a noun phrase or clause)
The clause "which are very dangerous" is a subordinate clause, adjective, that modifies "adventures."
An 'adverb clause' is a subordinate clause that modifies a verb, an adjective, or another adverb. It tells when, where, how, to what extent or under what conditions.
well for adjectives it must be a describing clause and for verb it must be a doing clause and for a adverb it must be a modifying clause
An adjective clause typically follows the noun it modifies and provides more information about that noun. For example, in the sentence "The car that is red is mine," the adjective clause "that is red" describes the noun "car." It usually begins with a relative pronoun such as "that," "which," or "who."
It is an adjective, Biogdegradable plastics, for example where it is used in the sense of a noun clause- Biodegradable modifies plastics.
A noun clause is a dependent clause that functions as a noun within a sentence, often serving as a subject, object, or complement. An adverb clause modifies a verb, adjective, or adverb by providing information about time, cause, condition, or manner, and usually begins with a subordinating conjunction. An adjective clause, also known as a relative clause, describes or modifies a noun or pronoun and typically begins with a relative pronoun like "who," "which," or "that." Each type of clause adds detail and complexity to sentences.
The adjective clause in the sentence is "who was sitting close to them." It modifies the noun "gentleman" by providing additional information about him.