| A | B |
|---|
| ancestor | a person from whom one is descended |
| ancestor | an early kind of animal from which later ones have developed |
| carnivore | a flesh-eating animal |
| comprehend | to understand |
| comprehension | the act of understanding |
| duration | the time during which something lasts or continues |
| evident | easy to see and understand; obvious |
| extinct | no longer existing or living |
| extinct | no longer active |
| ferocious | savage; fierce |
| ferocity | the state or quality of being fierce |
| gigantic | very large; like a giant in size |
| obscure | to cover up or keep from being seen |
| obscure | hard to see; hidden |
| obscure | not easy to understand |
| option | choice, or something that is available as a choice |
| optional | left to choice |
| premature | too early; happening or arriving before the proper time |
| preserve | to save; to keep from harm; to protect |
| preserve | to keep from rotting or spoiling |
| prey | an animal that is hunted for food |
| prey | one that is helpless or unable to resist attack; a victim |
| prey | to take from or rob using violence or trickery |
| prey | to hunt (animals) for food |
| puny | weak |
| puny | lacking in size, strength, or power |
| survive | to stay alive where there is a chance of dying or being killed |
| survive | to continue living or existing through a threatening situation |
| survivor | one who stays alive while others die |
