What do food chains show?

How long is an average food chain?

Can the arrows for food chains be written in any way?

What is the source of energy for all food chains?

Is the primary producer a herbivore/carnivore/omnivore or none of these?

Is the primary consumer
a herbivore/carnivore/omnivore or none of these?

Is the secondary consumer a herbivore/carnivore/omnivore or none of these?

Is the tertiary consumers a herbivore/carnivore/omnivore or none of these?

Can food chains have a quaternary consumer?

What is a trophic level?

Are food chains fully reliable?