9. Which of the following is the simplest unit of proteins? O lipids
O amino acids
carbohydrates
starch

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

Which of the following is a consequence of urban heat islands? increased precipitation downwind of the city? increased precipitation upwind of the city? decreased winds within the city? increased winds within the city?

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