how do they reproduce; eggs or direct birth?
Eggs
Amphibian
The egg of an amphibian is typically surrounded by a transparent gelatinous covering secreted by the oviducts and containing mucoproteins and mucopolysaccharides.
what is referred to as oort cloud? A theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 2,000 to 200,000 au from where did it originate? It is thought to have developed after the formation of planets from the primordial protoplanetary disc. what is it composed of? It consists of ices such as water, methane, ethane, carbon monoxide and hydrogen cyanide. what are the various states of the first one? solid phase, liquid phase, and the gaseous phase what kind of life form does it support? Nearly all fish, marine mammals, amphibians can you mention one characteristic of this last one? They are ectothermic, tetrapod vertebrates of the class Amphibia name one organism that falls under this? Frogs
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Amphibian [SEP] Eggs
The egg of an amphibian is typically surrounded by a transparent gelatinous covering secreted by the oviducts and containing mucoproteins and mucopolysaccharides. This capsule is permeable to water and gases, and swells considerably as it absorbs water. The ovum is at first rigidly held, but in fertilised eggs the innermost layer liquefies and allows the embryo to move freely. This also happens in salamander eggs, even when they are unfertilised. Eggs of some salamanders and frogs contain unicellular green algae. These penetrate the jelly envelope after the eggs are laid and may increase the supply of oxygen to the embryo through photosynthesis.