Level 2
Level 1

Level 1


26 words 0 ignored

Ready to learn       Ready to review

Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

All None

Ignore?
dodo
an extinct flightless bird that
elephant bird
an extinct family of birds which can not fly
quagga
is an extinct subspecies of plains zebra that lived in South Africa
sea wolf
lived in the ocean and had flippers
woolly mammoth
the common name for an extinct elephant of the mammoth genus,
extinct
no longer in existence; that has ended or died out
survive
To continue living (despite some danger or illness)
exploit
use (someone or something) in a way that helps you unfairly
endangered
that may soon no longer exist
habitat
The natural environment in which a species or group of species lives
species
a group of animals or plants that are similar and can produce young animals or plants : a group of related animals or plants that is smaller than a genus
sanctuary
shelter
atmospheric layers
The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet
scatter
to throw loosely about; distribute at irregular intervals
observation
an act or instance of noticing or perceiving
experiment
a procedure carried out to verify, refute, or validate a hypothesis
phenomena
very impressive or popular especially because of an unusual ability or quality
microscope
instrument with a lens for making objects larger so that one can see things more clearly
Bacteria
microscopic single-celled organisms that can be helpful, such as those that live in our guts, or harmful, such as flesh-eating
vast
very great; enormous
galaxy
large isolated system of stars, such as the Milky Way; collection of brilliant personalities
atom
the smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule
elements
one of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances
molecule
the smallest possible amount of a particular substance that has all the characteristics of that substance
mixture
a combination of different things
compound
to add too, too increase