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Vocabulary

Unit 5

Word list

aquatic

adj. If a plant or animal is aquatic, it lives or grows in water.

The dolphin is an aquatic mammal.

biosphere

n. The biosphere is the Earth’s surface and atmosphere where there are living things.

Birds, trees, and worms all thrive in the biosphere.

bizarre

adj. When something is bizarre, it is very strange.

My bizarre dreams make no sense to me when I am awake.

Celsius

n. Celsius is a scale for measuring temperature.

Water freezes at zero degrees Celsius.

coarse

adj. If something is coarse, that means it has a rough texture.

The coarse sweater made my skin itch.

companion

n. A companion is a person that someone spends a lot of time with.

I always walk to school with my companion, Frank.

digest

v. To digest means to swallow food and pass it through the body.

Allow some time for food to be digested before going swimming.

duration

n. The duration of an event is the time during which it happens.

The girls watched television for the duration of the evening.

ecology

n. Ecology is the study of the environment and living things.

We study ecology to learn how to help improve the Earth.

feat

n. A feat is an impressive or difficult achievement or action.

The elephant’s standing up on one leg was a feat.

infinite

adj. If something is infinite, it has no limit or end.

Many scientists believe that the universe is infinite.

nucleus

n. The nucleus is the central part of an atom or cell.

The nucleus is made up of many tiny particles.

parasite

n. A parasite is a tiny animal or plant that attaches to another animal to get food.

The sick dog was covered in parasites.

prominent

adj. When something is prominent, it is important and well known.

Queen Victoria was a prominent person in history.

repetitive

adj. When something is repetitive, it is repeated many times and becomes boring.

Working on an assembly line making cars every day is a repetitive job.

reproductive

adj. If something is reproductive, it is a living thing which can produce young.

The reproductive system of a plant is simple.

temperate

adj. When a place is temperate, it never gets too hot or cold.

In Peru, the weather is temperate and rarely gets too hot or cold.

tolerance

n. Tolerance is the ability to accept something unfavorable or to allow the freedom of choice for others.

Boxers have a high tolerance for pain.

undergo

v. To undergo an action means to have it happen to you.

The cancer patient undergoes treatments twice a week.

vulnerable

adj. When someone is vulnerable, they are weak and without protection.

He felt very vulnerable when he was stranded in the desert.