Tropical rain forest In the highlands of Mexico and the Andes region of South America: (a) farmers grow
the same crops at different elevations (b) temperatures are similar on the upper and
lower slopes (c) the length of the growing season changes with the elevation

Don't depend on this but logically i think c

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.

Ibelieve that is false not 100% tho