| A | B |
|---|
| population | number of people in a place or grouping |
| rapidly | very quickly |
| shortage | a state of not having enough, a lack of something |
| worry | to feel troubled or anxious |
| processed | changed from a natural state |
| decreasing | going down |
| eventually | ultimately; in the end |
| extinct | no longer in existence, especially a kind of plant or animal |
| critics | people who criticize or oppose something or someone |
| humans | people |
| methods | ways of doing something |
| experimenting | testing; trying |
| cages | areas enclosed with metal bars to keep animals from escaping |
