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Question		Answer
Preserved remains of once-living organisms start learning		fossils
A sticky layer that surrounds the cell walls of some bacteria, protecting the cell surface and sometimes helping to glue the cell to surfaces. start learning		capsule
To save; to keep from harm; to protect start learning		preserve
a very small amount start learning		trace
a mark of a foot or shoe on a surface start learning		footprint
to put into the ground and cover with earth start learning		bury
more than two but not many start learning		several
generally start learning		commonly
small, solid pieces of material that come from rocks or living things start learning		sediment
A mixture of rich soil and tiny rocks start learning		silt
A wetland ecosystem in which shrubs and trees grow start learning		swamp
a hole in the ground made by an animal for shelter start learning		burrow
A type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part. start learning		mold
a solid copy of the shape of an organism start learning		cast
containing nothing start learning		empty
The physical gap or interval between two objects start learning		space
fading away of memory over time start learning		decay
to become or make something become firm, stiff, or solid start learning		harden
A scientist who studies fossils start learning		paleontologist
a living being, especially an animal start learning		creature
go aimlessly; wander start learning		roam
having no doubt; sure start learning		certain
to look at something carefully by attention to its parts start learning		analyze
to develop gradually start learning		evolve
a series of x-ray photographs taken from different angles and combined by computer into a composite representation of a slice through the body start learning		CT scan
very old start learning		ancient
also, in addition start learning		additionally
extremely important start learning		crucial
technique of joining two pieces of fabric edge to edge start learning		piecing
the study of geographic phenomena by visiting places and observing how people interact with and thereby change those places start learning		fieldwork
Marked by richness of growth, especially of vegetation. start learning		lush
before written history start learning		prehistoric
prosper; flourish start learning		thrive
very large start learning		vast
proof start learning		evidence
Parts of something that are left after the rest is gone. start learning		remains
To keep something safe and stop it from being destroyed. start learning		preserve
A group of animals or plants of the same kind. start learning		species
No longer living anywhere in the world. start learning		extinct
To slowly become a fossil over a very long time. start learning		fossilize
A small sign that something was there in the past. start learning		trace
To slowly break down or rot after death. start learning		decay
An animal that eats animals that are already dead. start learning		scavenger
Full of healthy, green plants. start learning		lush
From a time before people started writing history. start learning		prehistoric
The slow way living things change over many generations. start learning		evolution
An animal that hunts and eats other animals. start learning		predator
Information or signs that show something is true. start learning		evidence
The complete disappearance of a species from Earth. start learning		extinction

Unit 1 English ENG

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