Why is pH so important to maintain life? A small change in pH in the ocean can be very harmful to sea life

Human blood is kept at a constant pH otherwise we would die

The pH of soil is very important for plant to be able to grown in it

Or all the above

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?