12. Fish identity card. How are
fish characterized according
to examples of representing
beings, basic morphology,
skin, respiration, circulation,
nitrogen waste, thermal
control and types of
reproduction?

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!
Examples of representing :
sharks, rays, sardines, , salmons.
Basic morphology: body,
fins; cartilaginous in
chondrichthyes, bony in
osteichthyes. Skin: scales in
osteichthyes placoid scales in
. Respiration: branchial.
Circulation: , incomplete, heart
with chambers. Nitrogen waste:
in chondrichthyes, ammonia
osteichthyes. Thermal control:
. Types of reproduction:
, internal fecundation in
, external in
osteichthyes.