Primero or secondary sources? a t-shirt from a rock concert

When two tectonic plates collide and one or both push upwards they also push up the crust,a mountain will for so that will be your answer. hoped this

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.

The answer is 148, i can't really explain it, i got frustrated and guessed because all of my math was not giving me any of the answer choices