TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: Overharvesting is a serious threat particularly to which species? Answer: aquatic species

SOLUTION: Overharvesting is a serious threat particularly to aquatic species.

PROBLEM: Question: Which proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms? Answer: antibodies

SOLUTION: Antibodies recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms.

PROBLEM: Question: What is formed when amino acids are linked together in a long chain? Answer: protein

SOLUTION:
A(n) protein is formed when amino acids are linked together in a long chain.