What structures of the internal anatomy of a clam might lead you to conclude that a clam is triploblastic

Construct at least two possible hypotheses for the student’s experiment.

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.

What is it called when lava when it erupts from the surface through volcanoes.