Answer:
The adjectives in the sentence are:
first
marine
hottest
coldest
some
deep
Step-by-step explanation:
An adjective can be defined as a word that modifies a noun or a pronoun by giving it a quality. For instance, think of the noun "boy". I can add adjectives before that noun in order to modify it. I can say "wise boy" or "young boy", for instance, to talk about his personality or his appearance.
In the sentences we are analyzing here, the adjectives are highlighted below. The nouns they modify are underlined:
The first surprise was that things lived everywhere. Marine species lived in the hottest and coldest places. Some species lived in deep places without light or oxygen.