When the grand canyon was forming, a population of squirrels were separated into two groups. the north side of the canyon is at a higher elevation and experiences more rainfall than the south side of the canyon. the two squirrel species you see here had a common ancestor, but over time, have evolved into two different species. how did natural selection lead to different species?

Which sets of mrna codons could genetically come for a protein with the following amino acid composition

Amembrane protein is made and inserted into the membrane of the rough endoplasmic reticulum. a binding site that is present in this protein is aligned so that it faces the lumen of the er. if this protein is then moved to other endomembranes, at which surface of the membranes given below is this binding site unlikely to be found? a. internal face of the golgi apparatus membranes b. the internal face of lysosome membrane c. facing the intermembrane space of the nuclear envelop membranes d. the lumen face of the vesicle just derived from the golgi apparatus e. the cytosolic face of the plasma membrane

Which two animals are most closely related? explain.