Explain this statement that how life is a complex mesh work involving a perfect co-ordination of a vast majority of chemical reaction?

What does it mean for a cell membrane to be selectively permable

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.

Me with these questions image attached