Amphibia is the class of vertebrates which is considered to be the first to develop lungs. This allowed amphibians to live successfully on land as terrestrial organisms. Ichthyostega was the first primitive amphibians with nostrils and lungs. Amphibians adopted themselves to live on land with developed lungs.
Yes, it is a weak acid called the citric acid
The answer is B. Speed up chemical reactions. Hope this helps.
Both have a pump that pushes materials throughout the organism.
I believe it would be A one will be eliminated
