test your knowledge

[filiportela]

no more joints for him.... lol

 

[skillzdatkillz]

I know......



















none of them
/cry

 

[Gr8KarmaSF]

i can hear oddball typing away right now!

 

[Tongue33]

bump

 

[guppy]

1. no air filled swim bladder, heterocercal tail,teeth regrow, hyostilic or amphystylic jaws, placoid scales


buoyancy control - oil filled liver
Swim control - heterocercal tail
Body covering - placoid scale, light weight protective, mods for protection
prey detection - appullare of lorenzini
Reproduction - internal fertilization

cartilaginous skeleton, placoid scales, ram ventilation efficient osmoregulated(nitrogen), large rectal gland, internal fertilization, large young

Shark, probably one of requeims

As for your first set of questions, hmmm.

1) teeth not fused to skull, cartilaginous skeleton, unsegmented epidermal fin rays.
The essay portions would take more time than I have right now but I believe that the #1 reason they were historically successful was that their time had come, haster, more adaptable, better armed, better senses, and active, well formed young meant none of the predators that shared their early environment were much competion.

Any way I got to go now.