pollutants that are released directly into the atmosphere and can cause damage all by themselves or may react with other products to cause damage are called what

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

2. given that most biochemical (other than coal) rocks react with hydrochloric acid, what does that tell you about organisms?

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming