The grasslands are a type of biotic community that is found in dry areas. They are dominated by grasses, but they also include other types of plants.
A wildfire is a large fire that is started by a small fire. A wildfire can quickly become a very large and dangerous fire.
The wildebeest is a large animal that is often seen on the African plains. It is a type of antelope, and it is one of the most common animals in the area.
To be infested is to be full of something unpleasant. The word can be used to describe anything from a room to a whole country.
To outnumber somebody is to have more people than they do. If there are 10 people in a room, and 20 people want to enter, the 20 people will outnumber the 10 people.
The instincts are the basic impulses that we have as humans. These impulses include things like hunger, thirst, and the need to survive.
When there are more people against you than there are people for you, it's called being outnumbered. This can be a really dangerous situation, because you don't have a lot of support.
To reverse something is to turn it around, to go in the opposite direction. When you reverse the polarity of a battery, you change the direction of the electricity.
When someone is unharmed, they are not injured in any way. They might be unharmed by the accident, or they might be unharmed by the other person's words.