Organisms and their Needs

In the forest all things affect the things around them.

In nature, no organism survives on its own.

All living things depend on other living and nonliving things to survive.

Whether it's a bacteria, a flower, or a tiger, all species must do 3 things to survive

Get and use energy

Reproduce

Maintain their structure

Oxygen or Carbon Dioxide

Water

Food

the right environment/shelter/temperature and space.

Cells need oxygen for the many chemical reactions in them

Animals breath oxygen

Fish getoxygen from water

Trees need carbon dioxide to make glucose

Some organisms need other gasses

On our planet all organisms need water, all the way down to their cells.

Plants absorb water through their roots

Animals dring water

Bacteria allow water to pass through their cell membranes

All creatures need food for energy and nutrients

Food also provides vitamins and minerals needed for our bodies to work.

Iron, for instance, is needed to build red blood cells that carry oxygen to our cells.

Why don't polar bears live in the desert?

All organisms have adaptations that make them suited for a particular environment

They must live in a place with the conditions that allows them to survive.

Climates and temperatures vary across our planet

Organisms usually have adaptations for a particular climate

Penguins are adapted to very cold climates

Many lizards are only adapted to relatively warm climates.

Shelter helps many animals survive

It provides for temperature control

It also provides protection

Anything that protects creatures from severe weather is a shelter

Not that kind of space

All organisms need a certain amount and kind of space to survive.

If too many animals live in an area, they will start to run out of food.

A single African Elephant can eat 330 lbs of vegetation in one day and drink 55 gallons of water!

Oxygen or Carbon Dioxide

Water

Food

the right environment/shelter/temperature and space.