1. in your own words, describe how scientists classify living things.

Well all animals are known for their characteristics so are placed in specific groups that match with their characteristics. Hope this helped :)

The members of each group of living things share a set of special features unique to that group. Scientists are always looking for these characteristics or 'observable features' which allow them to group different species together and see how they are related to each other.

then that particular organisms become extinct.