An organ is a? #1. Group of organs that work together.
#2. Group of similar cells that perform a particular function.
#3. Cell that has a specific function inside the body.

#2

Explanation:

Group of similar cells that perform a particular function.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

a chair, a bed, and a toothbrush

explanation:

i was told this before by a teacher, so yeah