Which process can be a source of genetic variation a. copying of chromosomes, b.binary fission, c.mitosis,.crossing over

What function does a limb serve in each animal how are the limb bones of the four animal similar based on the similarities what can be inferred about the evolution of the poor animals

What’s the student’s scientific question

The pacific plate is an oceanic tectonic plate. how did a hot and the pacific plate interact to form the hawaiian islands?