Natural Adaptation

Many birds, such as the barn swallow, have hollow bones, while a few birds, such as the ostrich, have solid bones. Which best explains this adaptation that are seen in birds?

• Hollow bones allow for a lighter body weight for flight.

• Hollow bones allow for more space for making more red blood cells

• Larger birds need solid bones to hold the weight when standing.

• Solid bones are an advantage because hollow bones are too brittle..

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Which of the following is NOT an adaptation that allows a polar bear to survive in its environment?

• Thick layer of fat and fur

• A herbivorous diet

• Large paws for traction in snow and ice

• White fur for camouflage

Which of the following is NOT an adaptation that allows a cactus to survive in the desert?

• Its green color

• Spines for protection

• Large stems for water storage

• Wide root systems

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The statement, "Organisms that are better suited for their environment are more likely to survive and reproduce," is part of what scientific theory?

• adaptations

• natural selection

• selective breeding

• genetic engineering

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What did Charles Darwin study on the Galapagos Islands?

• turtles

• lizards

• finches

• seeds

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What main characteristic of finches did Darwin study?

• a. Feathers

• b. Coloration

• c. Beak shape

• d. Wing shape

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The theory of evolution by natural selection states...

• a. Organisms better suited for their environment are likely to become extinct

• b. Organisms change into completely new organisms

• c. Organisms have a better chance of survival if they migrate and hibernate

• d. Organisms better suited for their environment are more likely to survive and reproduce

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The adaptation in some fish of increased gill surface area has allowed...

• them to be better swimmers

• them to absorb the oxygen in the water more efficiently

• them to reproduce easier

• them to better camouflage

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Which of the following adaptations helps birds fly?

• They have more fat than most animals, so they can fly for long distances.

• They have hollow bones, so they are lighter.

• They have smaller blood vessels, so their hearts have to work less in flight.

• They have a larger stomach, so they can absorb food faster.

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A desert is a biome that can have extremely harsh living conditions. Which of the following adaptations do NOT help animals survive in this type of environment?

• Animals add fur to maintain their bodily temperatures.

• Water is stored in fatty tissues in the body.

• Animals burrow deep in the ground during the day.

• Many animals are nocturnal which helps them avoid sunlight