Select the living thing.
A: pushpin
B: stop sign
C: boulder
D: barnacle
A pushpin is not a living thing.
Pushpins 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.
A boulder is not a living thing.
Boulders 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.
A stop sign is not a living thing.
Stop signs 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.
A barnacle is a living thing.
Barnacles grow and respond to their environment. They need food and water. Barnacles are made up of many cells.
Barnacles are animals. They are related to crabs and lobsters. Barnacles attach to rocks, boats, and other animals.