fossil – n. remains of an animal or plant from the past that are found in rock

algae – n. a simple plant that grows in or near water

sediment – n. a solid substance that forms a later at the bottom of a liquid

descendant – n. someone related to someone who lived a long time ago

biosphere – n. the part of the Earth's environment where life exists

adapt – v. to change for a new purpose or use

conquer – v. to defeat or take control of something