Humans need oxygen to survive. which organ system is responsible for bringing oxygen into the body from the atmosphere?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c

An ant travels at a constant rate of 30cm every 2 minutes.at what speed does the ant travel per minute

What is solution for the following system of equations, 2x+8y=4 and x=-3y+5 1) x=14 y=-3 2) x=2 y=-3 3) x=-3 y=-3 4)x=12 y=5