Please help:(. Alia needs to order the following isotopes by atomic number. Use what you know about atomic number and isotopes to drag and drop the tiles in order of increasing atomic number from lowest to highest.

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary

Which description shows competition in an environment? an organism that feeds on some food an organism that finds a place to sleep three organisms of the same species living in an area three organisms battling over limited resources