Which of the following determines the identity of an element? a. atomic number
b. mass number
c. atomic mass
d. overall change

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 characteristic make legumes a good food source for food insecure populations

What are the student's observations and inferences before he starts his investigation?