bripat9643
Diamond Member
- Apr 1, 2011
- 170,169
- 47,316
Octopoids don't have to deal with gravity. Extra arms are not so much of physiological burden. They are also cold blooded, which makes them even less of a burden. Humans live on land, where fighting gravity consumes a lot of energy. So does being warm blooded. All land dwelling vertebrates have four limbs for a reason. It's the most energy efficient configuration. It's the same reason you seldom see cars with more than four wheels. Some dinosaurs almost went to only two limbs, like T-Rex.When something is redundant, evolution tends to get rid of it. Rarely are there occasions when multiple things need to be done at the same time. Can you name any?How so? If we had four arms, two of the would rarely get used.
Multiple limbs allow multiple jobs to be done at the same time. Also, redundancy. Lose a limb as a human and it is a significant loss. Lose a limb as an octopus, and it is not nearly as significant.
The minimum number of limbs required for walking is two. The same number are needed to carry things or to manufacture tools. Anything more is redundant.
Then why do we have octopoids? Who have been on this planet for far longer than man has?