Answer : 1. "It is a type of virus that infects bacteria"
Explanation :

Researchers developed a new method to store, identify, and share bacteriophages, making them more accessible to patients. Bacteriophages, or phages, are viruses that infect and destroy bacteria, making them the most common biological entities in nature. Found in diverse environments, phages consist of a nucleic acid molecule surrounded by a protein structure. Thousands of varieties exist, each targeting specific bacteria or archaea.