One group of students studied with the TV on. Another group of students studied in silence. what is the Controlled variable?

the students

Explanation:

hello

question:

when would a new household be started?

a.when the oldest male died

b.when a man and a woman married

c.when the house could not hold everyone

d.when a child was born

answer: us d when a child was born

hope this have a great day and brainlest

answer; ewing's sarcoma;