Which has a base of 5cm and an area of 50cm.

A = 1/2 * b*h

50 = (1/2)*5*h

50 = 5/2h

h = 50/(5/2)

= 20 cm

1. Over-hunting
2. A disappearance of a primary food source
3. Drought
4. A more competitive species taking food
5. Different environment conditions that is difficult for the species to survive
6. Something killing off a certain gender of a species
Hope it helps! :)