9. What are primary
consumers? Can a food chain
present quaternary consumers
without having secondary or
tertiary consumers? Can a
tertiary consumer of one chain
be a primary or secondary
consumer of another chain?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
Primary consumers are living
that eat autotrophic beings, .e., they
eat the producers. consumers
always belong to second trophic
level of chain.

A food chain have consumers of
superior without having the
consumer the inferior orders. A
however can participate in
different chains not always
to the same consumer
in each of them.