Bones are covered and lined by a protective tissue called periosteum. the inner (osteogenic) layer consists primarily of a) chondrocytes and osteocytes b) dense irregular connective tissue c) osteogenic cells d) cartilage and compact bone

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.