Which type of jelly fish has the ability to reverse age its self when it becomes a certain age ?

When does dna replication(make a copy of itself)?

Why do german shepherds shed so much

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.