Choose the word or phrase (A, B, C, or D) that best fits each space in the following passage.
WHY DO ANIMALS GO EXTINCT?
Different kinds of animals have appeared and disappeared throughout Earth's history. Some animals go extinct because the climate (31) they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the new climate, they die.
Some animals go extinct bacause they cannot (32) with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving means that the animals are changing (33) from generation to generation. Small differences between parents, children, and grandchildren slowly add up over many, many generations. Eventually, a new kind of animal evolves.
Sometimes many of the animals on Earth go extinct at the (34) time. Scientists call this a mass extiction. Scientists think there (35) at least five mass extinctions in Earth's history. The last mass extinction happened about 65 million years ago. This mass extinction killed off the dinosaurs.
(35)
A.have been
B.will be
C.are
D.has been
WHY DO ANIMALS GO EXTINCT?
Different kinds of animals have appeared and disappeared throughout Earth's history. Some animals go extinct because the climate (31) they live changes. The climate may become wetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the new climate, they die.
Some animals go extinct bacause they cannot (32) with other animals for food. Some animals go extinct because they are killed by enemies. New kinds of animals are always evolving. Evolving means that the animals are changing (33) from generation to generation. Small differences between parents, children, and grandchildren slowly add up over many, many generations. Eventually, a new kind of animal evolves.
Sometimes many of the animals on Earth go extinct at the (34) time. Scientists call this a mass extiction. Scientists think there (35) at least five mass extinctions in Earth's history. The last mass extinction happened about 65 million years ago. This mass extinction killed off the dinosaurs.
(35)
A.have been
B.will be
C.are
D.has been
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