Why might a cell NOT need to duplicate? (select all of that apply) 1. That cell is no longer needed in the body
2.it is unhealthy
3. it is efficient at its job
4.the tissue it is a part of does not need growth or replacement

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? the wings are analogous structures that evolved differently and do not have a similar internal structure. the wings are homologous structures that evolved differently and do not have a similar internal structure. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. wings of bats are vestigial structures, but the wing structures of birds are not vestigial.

What causes darkening of the skin as melanin production increases

Which type of stimulus do mechanoreceptors detect? sound pain heat light