Answer:Amphibians evolved during the middle of the Devonian period (416 to 359 million years ago) from the lobe-finned fish of the vertebrate class Sarcopterygii. Species within the genus Ichthyostega (members of the Labyrinthodontia subclass) are considered by some scientists to be the earliest amphibians.
Explanation:
Answer:
c.16J
Explanation:
because kinetic energy =1/2mv²
1/2 ×2×4²=16J
Answer:
A. Valine has replaced glutamic acid
Explanation:
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