1. Humans (and all animals): DNA is the blueprint of life, carrying the genetic instructions for building and maintaining an organism.

2. Plants: Like animals, plants also use DNA to store their genetic information.

3. Bacteria: These single-celled organisms also have DNA, although their DNA is typically circular and found in a region called the nucleoid, rather than within a nucleus like in animals and plants.

It's important to note that almost all living things have DNA. There are a few exceptions, like some viruses that use RNA instead.