Organism Structures and Functions

What is one possible reason for seeds to have hooks or barbs?

• to stay warm during the winter

• to protect themselves from sunlight

• to get attached to passing animals and get carried away

• to be easier for animals to eat them

Why might some plants have thorns?

• to stay safe from animals that want to eat the plant

• to attract insects that spread pollen to other plants

• to take in nutrients from the air

• to provide shade for the plant

Unlike humans, otters have special flaps that close off their nostrils and ears. These flaps help otters survive in an environment that is -

• terrestrial

• snowy

• windy

• aquatic

Aquatic plants have adaptations that help them live in water. For example. the structures needed for making food are located on the tops of the floating plant leaves. This adaptation helps the plants-

• absorb sunlight

• stay anchored

• avoid predators

• capture fish

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Newly hatched chicks of many types of birds, such as parrots, are covered in soft , fluffy down feathers. These feathers contain many small spaces where air gets trapped. In some animals species, such as Arctic foxes, the fur covering the animal's body consists of hollow strands of hair filled with air. The primary role of the air trapped in the down feathers and fur is most likely to -

• act as a cushion to prevent injury from falls.

• decrease the amount of energy needed for running or flying.

• provide a layer of insulation to help control body temperature.

• supply oxygen to be absorbed by the skin to be transported to the lungs.

Coloring or another physical characteristic that help an organism blend in with its environment

• mimicry

• camouflage

• hibernation

• migration

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Any living thing

• cell

• unicellular

• multicelluar

• organism

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All __________ are composed of cells.

• cell

• organisms

• multicellular

• functions

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__________ organisms are composed of different kinds of cells.

• cell

• organisms

• multicellular

• functions

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Cells from different parts of an organism have varying structures and __________.

• cell

• organisms

• multicellular

• functions

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