21st Century 3 Unit 6 Vocabulary

helpful; causing something to happen

• massive

• instrumental

• precious

grouping of living things

• species

• barrier

• thrive

attach firmly

• fragile

• habitat

• cement

something that blocks the way

• barrier

• preservation

• cement

protection from harm or change

• instrumental

• preservation

• thrive

huge, great in number or size

• thrive

• fragile

• massive

extremely valuable

• species

• precious

• habitat

grow strong and healthy

• instrumental

• thrive

• massive

the areas in which animals and plants normally live

• habitat

• fragile

• cement

easily broken or harm

• species

• fragile

• instrumental