Nhat does the word Tundra mean? (hint: its two words)

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

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 type of plant is good for a bioassay and where can i buy it? i only have a month.