Starvation? the human population can grow so much where we populate faster than we eat food and we use up all of our resources (food).
It's empty or fairly large, making the sounds from your hands bounce of the walls and therefore having it echo
This info provided seems to be that you are of a healthy weight
The answer is in the order of:
E
C
D
B
A
Emptying an aquarium containing non-native species into a local waterway, this would cause a whole new group of species to inhabit the waterway.
