Which of these statements about nonrenewable resources is true? O They are inexpensive.
O They help keep the air clean.
O They can take millions of years to form.
O They are used because they are easily removed from the ground.

The chemical effect of the endocrine system is longer lasting than the chemical effect of the nervous system. select the best answer from the choices provided t f

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward