The Tundra

Biotic factors: Healths, moss, polar bears, reindeer, lemmings.

Abiotic factors: Strong winds, poor soil, short summer days.

Carrying Capacity

Carrying capacity: Largest number of individuals of one species that an environment can support.

An example of population change in the tundra is a polar bear and an arctic fox.

Limiting Factors and
predator/prey relationships

A limiting factor is an input or variable such that a small change in it from the present value would cause a non-negligible change in an output. Some limiting factors in the tundra are poor soil, limited growing season, cold temperatures.

A predator/prey relationship in the tundra is a brown bear(predator) and an arctic hare(prey). But limiting factors sometimes affects the relationship because if there is a lack of food for the hare then they will soon die causing the brown bear no not have food.

Energy roles

The energy roles in an ecosystem is producer, consumer, decomposer. Each of them play a big role in every ecosystem.

Producers are organisms that make their own food using energy from the sun. They are what start everything.

Consumers are organisms that eat plants and animals. There are different types of consumers as in primary, secondary, and tertiary consumers.

Decomposers are organisms that turn dead things into nutrients for producers. They are the things that start everything over.

Food chains and food webs

Food chains and food webs show the flow of energy through an ecosystem. Food webs show more than food chains because they show more food chains in one.

If you took away grass then the consumers would not get as much energy as they usually would.

Trophic levels and energy pyramids

The reason it is the shape of a pyramid is because it shows the amount of energy that each organism has.

Producers are always at the bottom of the energy pyramid because they get energy from the sun and they make their own food.


There are certain formulas for the process of photosynthesis.

formula: 6CO2 + 6H2O -----> C6H12O6 + 6O2.

There are some stuff that are needed for photosynthesis as in sunlight, chlorophyll, water, and carbon dioxide. Glucose is then created to make food for the producers.


Tropism: the turning of all or part of an organism in a particular direction in response to an external stimulus.

A plant moving towards the sun is an example of tropism.

Tropism helps plants survive because they can change their growth in response to their environment.

The role of decomposers

Decomposers decompose dead organisms and turn it into nutrients for producers to start the whole process over. If there were no decomposers then the world would be full of trash and plants would not the nutrients they need.

Some decomposers in the tundra would be fungus, mushrooms, worms, and bacteria.


Adaptations are what organisms have to help the survive. There is structural and behavioral.

Some adaptations that animals in the tundra have is claws so they can scratch, or thick fur so they are warm when its cold. Some adaptations that plants in the tundra have is air on their pedals to keep warm, or they are close to the ground to keep from freezing.

If you placed a polar bear into the dessert then it would get to hot because it has thick fur.

Natural selection

Natural selection: Gradual process by which heritable biological traits become either more or less common in a population.

Comment Stream

2 years ago

Add some stuff!😬😬😬

2 years ago

You need to add more but love the pic👌

2 years ago

You should have steps 1 and 2 done already. You need to get caught up ASAP!

2 years ago

great maybe add more pics and examples

2 years ago

you should actually do it😄