Question 20 (5 points) Which of the following is formed when a group of tissues works together to perform
a common function?
OA) Body
B) Organ
C) Brain
D) Organ system

The answer is B) organ

explanation: Cell is the basic unit of life. A group of cells having same structure and performing same function forms tissue. A group of tissues performing a particular function in the body forms an organ. A group of organs that work together to maintain a stable internal environment and perform a particular function is called an organ system.

It is evolution, because we all have some of the same traits like eye color or shape or ears.