| A | B |
|---|
| perfect | something that has nothing wrong with it |
| challenge | a task that requires extra effort |
| healthy | well, not sick |
| satisfy | meeting people's needs; making them happy |
| manage | able to do something even if it is not easy |
| scratch | cut or scrape |
| appetite | a felling of wanting to eat |
| prickly | difficult or having small sharp thorns |
| snuggling | holding closely to show love |
| protectively | in a way that keeps from harm |
| cells | the basic building blocks of life |
| vertebrates | animals that have backbones |
| mammals | warm-blooded animals that have backbones |
