An ecosystem cannot repair itself

after a volcanic eruption

after a flood

after a tornado

after a houseing development is built

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?

Prokaryotic and eukaryotic cells are different in many ways other than the presence or absence of a nucleus. if both archaebacteria and eubacteria are prokaryotic cells, then why are archaebacteria more closely related to eukaryotic cells than they are to eubacteria?

Under which of the following circumstances would natural selection not operate on an organism