Select the living thing.

 - manta ray
 - computer
 - soap
 - yo-yo
A computer is not a living thing.
A computer does not have all the traits of a living thing. It does many useful things, and even responds to the world around it. But it does not grow. It does not need food or water.
A yo-yo is not a living thing.
Yo-yos do not have all of the traits of living things. They do not grow or respond to their environment. They do not need food or water.
Soap is not a living thing.
Soap does not have all of the traits of a living thing. It may change shape or become foamy, but it does not grow. It does not need food or water.
A manta ray is a living thing.
Manta rays grow and respond to their environment. They need food and water. Manta rays are made up of many cells.
Manta rays are animals. They use their wide, flat fins to swim.