cos fish and other simpler animals have single circulation, but how did it change from one to the other? thats a bit of a big mutation isnt it?
2006-06-21 06:28:27 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
You have to look at evolution as a series of slight beneficial changes that are passed down through generations. The steps from single to double circ are unknown to me, but it is more than a single big jump.
2006-06-21 07:36:31 · answer #1 · answered by Schmorgen 6 · 3⤊ 1⤋
oh please, where did u found written or heard said it was one mutation, that is absolute nonsense, a mutation is an alteration of genetic material in a single step, single flip, or single generation if it concerns the germline and transfer of mutation to the "children". but what you are asking about is a long term process of evolution - over unconceivable periods of time, also with many different "branches" of the development "tree" rather than a single line
2006-06-21 06:54:56 · answer #2 · answered by iva 4 · 0⤊ 0⤋
Yes, but it didn't happen in one go. Birds and some reptiles already have it (certainly the ones birds evolved from already did) and all mammals.
2006-06-21 06:33:46 · answer #3 · answered by evil_tiger_lily 3 · 0⤊ 0⤋