Answer:
community College program and maddie d
Explanation:
work business work and maddie
Its breathing that is moving it is digesting and
Answer:
d ≈ 320000 km
Explanation:
Echoes occurs as a result of the bouncing back of sound waves as it impinges on an obstacle. Since the echo covers two distances (i.e forth and back) the distance is written as 2d.
Velocity of radio waves is taken as the speed of light = 
time =2.15s
DISTANCE = VELOCITY *TIME
2d=vt


d= 322500000m
Distance to the moon is approximately 320000km
The nuclear forces are very short range whereas the electromagnetic force has a long range.