Barron UNIT 1

It is important to develop more_____friendly logging practices.

• environment

• environmental

• environmentally

The shade of trees provides a ______ against the drying effects of the sun.

• defense

• defender

• defend

Soil _____ leads to the pollution of stream and rivers.

• erode

• erosion

• erosional

• erosioning

Some ______ avoid eggs and dairy products as well as meat.

• vegan

• vegetarians

• vegetable

• vegetation

Factories add _____ to the air and water.

• pollution

• pollutions

• pollutant

• pollutants

Our research plans have gone through many ________ and are now quite different from our original plans.

• evolutions

• evolves

• evolutionaries

The study of the lives of birds ______ many people.

• fascination

• fascinated

• fascinates

• fascinating

Scientists study the habits of ______ birds.

• migration

• migrant

• migrate

• migratory

Migratory birds are born with ______ skills; they don’t have to learn them.

• navigation

• navigational

• navigator

• navigate

If birds become aware of the presence of an ______, they quickly fly away.

• observer

• observation

• observe

• observant