Archaebacteria

 Archaebacteria:

1. These  Bacteria are specially   live in the the some of the most rigid habitats  such as extremely halophiles' (salty area) thermoacidophiles (hot springs ) and methanogens (marshy area )
2. it is different  from the other bacteria in having  different cell wall and structure and this is responsible for their survival in a extremes  situations.
3. Methanogen are present in the gut of several ruminant animals such  as  cow and Buffalo is they are the responsible for the production of methane (biogas) from the dung of these  animals 

Amphibian

 

The word amphibian these are come from the greek Word (Amphi : Dual ,Bios ,life )

They are colded blooded Animals 

Sex are separated and fertilization is external 

They are oviparous and development is indirect .

 these animals can live in aquatic as well as terrestrial habitats.most of them have two pairs of limbs 

They Body is divided into head and trunk . tail may present in some animal .the amphibian skin is moist (without Scale ) the eyes have eyelids and tympanum are present in the ear . alimentary canal,Urinary and reproductive tracts open into a common chamber is called cloaca which opens to the exterior . respiration by gills ,lungs and skin through .

Their heart is three chambered (two auricles and one ventricle ) 

Example of  amphibian is :-

Bufo (toad) ,Rana (frog) , Hyla (tree frog) itchyophis (limbless Amphibian ).