Which statement about polymers is true?
1.polymers are substances that have relatively large molecules.
2.oil and gas are the starting materials for making all polymers.
3.fabrics such as cotton and silk are synthetic polymers.
4.all polymers are obtained from living organisms.

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?