In Amphibia:
I. Skin is moist without scales
II. A tympanum represents the ear
III. Fertilization is external
1. Only I and II are correct.       

2. Only I and III are correct.
3. Only II and III are correct.           

4. I, II, and III are correct.

In which one of the following, the genus name, its two characters and its class/phylum are correctly matched?

In which of the following sets of organisms, does the external fertilization occur?

1. Echinodermata and mosses

2. Hemichordata and ferns

3. Amphibians and algae

4. Reptiles and gymnosperms

Which one of the following sets of animals share a four chambered heart?

1.  Amphibian, Reptiles, Birds

2.  Crocodiles, Birds, Mammals

3.  Crocodiles, Lizards, Turtles

4.  Lizards, Mammals, Birds