Answer: cell —> tissue —> organ —> organ system
aka. D
Answer:
It's d , activity level
Explanation:
Tempratement is something you are born with and it defines how an individual respond to the world
While activity level is the amount of motion that a child performs while doing some physical activity
They start in utero when the baby moves and kicks inside
When they grown up ,some children possess more energy and they don't seem to stay at one place
When they grow up they will jump and run a lot ,those who are highly active
