In ______ for your help, I bought you a present.

Last month I read a _______ fiction book.

There needs to be a ________ en every ecosystem.

The elements in an ecosystem that aren't alive are called...

All the biomes and the elements inside them are part of the...

Autotrophs are characterised by their...

We need the _________ of everyone, or the project will fail.

Autotroph _____ don't need to eat food.

Herbivores have a ______ on plants.

The _______ process give nutrients back to the soil.

The organisms responsible for decomposition are _______.

Any living being in an ecosystem is a _______ factor.

Every _______ has biotic and abiotic factors interacting.

The ______ between autotrophs and heterotrophs makes food chains.