1.where do most amphibians have to reproduce and why do they reproduce in that particular location?
2.in reproduction, do frogs have internal or external fertilization?
3.what is metamorphosis?
4.besides the use of gills and lungs, how else can amphibians obtain oxygen?
5.what type of symmetry do frogs display?
6.how do we know when it is mating or breeding season for frogs?

the function of the protein macromolecule is to move things in and out of the cell and transport other molecules in the body. there are many functions of proteins. they are the basic building blocks of living things and are responsible for the growth and repair of body cells and tissues.

explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands