How might an increase in green spaces contribute to sustainability? Provide an example to support your claim.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

i think the answer is a.keratin is the pigment responsible for skin color.