Help with biology?

1.a sheet of muscle called the diaphragm is found in


a.birds


b.mammals


c.reptiles


d.A and B


e.B and C


b?





2. Differentiation of teeth is greatest in


a.sharks


b.mammals


c.amphibians


d.reptiles


e.bony fishes


b?





3.among the invertebrates, arthropods are unique in possessing


a.a notochord


b.jointed appendages


c.open circulation


d.segmented bodies


e.ventral nerve cords


b?





4.which of the following five structures would you be more likely to find in an organism showing radial symmetry?


a.a head


b. a well developed central nervous system


c.tube feet


d.fins


e. a muscular tail


b?





you dont have to answer all just tell me the ones you know please this is hard as heck lol and im researching all over the internet, thanks in advance

Help with biology?
1. B


3. D
Reply:2. Differentiation of teeth refers to having teeth of varying sizes and shapes in the mouth (as opposed to having teeth that looke pretty much the same, although they might be larger and smaller in differnt parts of the jaw).


4. Radial symmetry indicates a central node from which the body plan extends in all directions, right? A starfish has radial symmetry, and so does a jellyfish. This may help you work it out.. Oh, by the way, I think the question is asking for which of those things you would be more likely to find in a radial animal than a non-radial animal. If it's common in non-radial animals, then it's probably not the right answer..



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