Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
fossil – n. something (such as a leaf, skeleton, or footprint that is from a plant or animal which lived in ancient times and that you can see in some rocks
asteroid – n. any one of thousands of small planets that circle around the sun
author – n. a person who has written something
evolutionary – adj. describing the process by which changes in plants and animals happen over time
feathered – adj. covered in any one of the light growths that make up the outer covering of the body of a bird
teeth – n. the hard white objects inside the mouth that are used for biting and chewing
picky – adj. very careful or too careful about choosing or accepting things
aftermath – n. the period of time after a bad and usually destructive event
lineage – n. the people who were in someone's family in past times
key – adj. extremely important
