(a) erosion
because its done by water to rock
Tropical cities have low climate and have rainy weather
The role is to carry urine from the kidney's to the bladder.
The answer is option A "be affected." Every species is prey and a predator. For example a fox eats rabbits and a mountain lion eat's the fox. So if a fox species dies rabbits population would increase (since how they have one less predator to eat them) and mountain lions population would decrease. (since how they lost a food source so they will starve)
Hope this helps!