Atable exerts an upward force on a pencil. what type of force is this? a. weight b. normal force c. frictional force d. gravitational force

Which best describes the scientific process

Ecologist have observed a sharp increase of sulfur dioxide in the air . what might be a possible consequence of excessive sulfur dioxide in the air ? a. acid rain b. ozone layer depletion c.ozone layer hole d.increase in sea levels

What is the key to the recognition of codominance?