Organisms

[larock01]

A biologist isolates an organism from a pond and describes it in his lab notebook as having both a larval and an adult stage, air-breathing lungs, the digestive system of a carnivore, eggs that lack shells, and camouflage epidermis that secretes toxins, and as exhibiting external fertilization. What is the organism being described?

I am hesitating on the following:
- A snake
- A frog
- A freshwater clam
- A salamander
- A lungfish

Thanks in advance for your much needed help!

[February Beetle]

A snake doesn't have a larva and adult stage.

[larock01]

im thinking lungfish or salamander? However, I am not sure.
Can someone help?

[alextemplet]

My guess, for what it's worth, is frog.

[larock01]

Can anyone else maybe confirm that?

[kiekyon]

yeah, a frog.

[Linn]

What is a ......

Clam

[larock01]

Here is what clam is:

http://en.wikipedia.org/wiki/Clam

[Linn]

A snake ...No
- A frog ....No
- A freshwater clam ...YES!
- A salamander...No
- A lungfish >>>No

The larva stage of clam

[Linn]

1.deduction by elimination.
2. research key word: clam larva stage

[Beetle]

How can it be clam when it has air-breathing lungs?! It is frog or/and salamandra. There are no difference between them in these shown characteristics except maybe for camouflaged skin which is more common in frogs although some salamanders can have it too (although thay usualy have aposematic colored skin). So I say it is most definatly FROG!

[kabuto]

sounds like a rog for me, ok not all frogs but i definitey have heard of frogs that produce very powerful toxin