Why do turkeys huddle together?

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

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