Plants and animals can lose their __________ when people clear forests.

Pollution increases when __________ are drained.

An organism that is new to an environment can harm it by competing for __________ that other plants and animals need.

You protect the environment when you __________ the amount of paper you use.

You protect the environment when you __________ newspapers to line pet cages.

Businesses protect the environment when they __________ old newspapers into new paper products.

When you plant a tree, you help keep __________ from washing away.

Reducing, reusing, and recycling paper products helps plants and animals by:

________ is to turn old things into new things

_____ is when harmful materials get into the air, land, or water

________ is an animals that hunt other animals

_____ is something that helps an organism survive

_____ is to use something again

_____ is the struggle for survival among living things

_____ is to use less of something

Organisms can cause change by _______ for resources, such as water and space, among living things.

People know about organisms that lived long ago because of remains called _________________?

A type of organism that has no living population is said to be _________________?

Ice covered much of Earth during the _________________?

Scientists learn how animals moved by studying their _________________?

Fish fossils found on __________ teach us that the area was once covered by __________.

The __________ fossils are usually deep below the surface of the ground.

The __________ fossils are usually below ground but close to the surface.

Fossils do not show how organisms used their __________.

Elephants today are similar to __________ that lived long ago.

The pterodactyl was a flying reptile that used its beak and claws to catch fish, just as the __________ does today.

Tropical plants can be found where it is hot and rainy. Fossils of tropical plants have been found in a place where it is cold today. What can you infer from this finding?

I am an ancient animal that used a trunk as elephants do today. Who am I?

I am a big animal that became extinct when the climate changed thousands of years ago. Who am I?

During my time, large ice sheets covered much of the land. What am I?

Scientists learn about ancient organisms by studying fossils. They learn how animals looked, how they moved, and what they _______________.

Some living things today look _______________ to organisms of long ago. Scientists can infer from them how ancient organisms used their _______________.

From fossils, scientists also learn how _______________ has changed over time.

They find fossils in its rock _______________.

Scientists think that some animals are _______________ because of natural events.

Dinosaurs may have died when a(n) _______________ hit Earth.

An environment can change when a(n) _______ covers dry land with water.

Living things are harmed when they do not get enough water during a(n) _______.

Floods and droughts are types of _______.

Some bacteria and mold can cause _______ that harm many living things.

What type of organism has a very small population?

People can cause organisms to become endangered when they _______ them.

Would animals in a forest be harmed if a disease spread that only affected plants?

A long period of time with no rain

something that covers dry land with water

Can be caused by bacteria or mold

Can start when lightning strikes a dry area

All of the organisms in an ecosystem

When an organism has only a few living members of its population left

All of the members of a single type of organism in an ecosystem

Look at the picture carefully. Decide if the picture shows a population or a community.

All of the animals in the rain forest.

Look at each picture carefully. Decide if the picture shows a population or a community.

The deer in the forest.

Look at each picture carefully. Decide if the picture shows a population or a community.

The sharks in the Pacific Ocean.

Look at each picture carefully. Decide if the picture shows a population or a community.

All the species in the ocean.

Look at each picture carefully. Decide if the picture shows a population or a community.

The penguins in Antarctica.

Look at each picture carefully. Decide if the picture shows a population or a community.

All the organisms in the desert.

Look at each picture carefully. Decide if the picture shows a population or a community.

The Cardinals in Virginia.

Look at each picture carefully. Decide if the picture shows a population or a community.

All the animals in the grasslands.

Which 2 are decomposers?

How do decomposers help plants?