I’m not sure I agree with the two system rejection here. Not saying it’s not correct but I think before suggesting that system redundency is not an evolutionary outcome here merely because we don’t see other species developing magnetic sensing seems wrong.
First, I think we need to consider just how critical such an ability is for survival of the species. If most other species have near 0 benefit from sensing the magnetic fields then one should not be surprised they don’t have it.
On the other hand, I’ve seen a suggestion that primates (I actually don’t recall the claim limited to primates but seems most accurate) only evolved two arms, legs, ears, eye because more added little value but if they only had one lossing it would essentially result in nonsurvival.
The introduction was setting up an apparent contradiction to be resolved later. It’s obvious that any apparent contradiction must have a way of being resolved.
Walking and swimming animals don’t have near-zero benefit from sensing magnetic fields. And some of them—but only a fraction—do have some (seemingly less-accurate) way of sensing magnetic fields.
Primates have 2 arms and 2 legs because they evolved from animals with 4 legs and bilateral symmetry.
I’m not sure I agree with the two system rejection here. Not saying it’s not correct but I think before suggesting that system redundency is not an evolutionary outcome here merely because we don’t see other species developing magnetic sensing seems wrong.
First, I think we need to consider just how critical such an ability is for survival of the species. If most other species have near 0 benefit from sensing the magnetic fields then one should not be surprised they don’t have it.
On the other hand, I’ve seen a suggestion that primates (I actually don’t recall the claim limited to primates but seems most accurate) only evolved two arms, legs, ears, eye because more added little value but if they only had one lossing it would essentially result in nonsurvival.
The introduction was setting up an apparent contradiction to be resolved later. It’s obvious that any apparent contradiction must have a way of being resolved.
Walking and swimming animals don’t have near-zero benefit from sensing magnetic fields. And some of them—but only a fraction—do have some (seemingly less-accurate) way of sensing magnetic fields.
Primates have 2 arms and 2 legs because they evolved from animals with 4 legs and bilateral symmetry.