Reason a is the correct one, as the european union has nothing to do with protection from invasions and Germany reunified many years ago.
Economic opportunities seems to be the driving factor for migration nowadays. An example of a group of migrants migrating from areas with a lack of economic opportunities to areas with more economic opportunities are Mexican immigrants seeking job opportunities.
Answer:
The plant's tubelike structure to carry water is called stomata.
A i think is the correct answer
Higher silica content means higher viscosity. But lower temperatures and low gas content mean higher viscosity. Hence, lower viscosity and low gas content mean higher temperature of magma.