Answer:
Independent: electronics in room
Dependent: hours of sleep
Control: school nights, night routine, lighting of room, the time the person decides to go to bed
Confounding: the person(?? not entirely sure on this one)
Answer:
He needed to do the seven-seven approach.
Explanation:
Please i need a Brainly
Answer:
The skin
Digestive tract
Vagina
Mucous membrane
Explanation:
The skin prevents microbes from entering the body
Digestive tract e.g. stomach acid is a natural defence mechanism
The vagina is acidic and this prevents harmful bacteria from growing with it's own flora.
Mucous membranes e.g. lining of the mouth, nose, eyelids are all defense mechanisms.
Answer:
The immune system and blood cells
Explanation:
3x - 4y = 24
- 3x - 3x
---------------------------
-4y = -3x + 24
------ ------- -----
-4 -4 -4
y = 3/4x - 6