Soybean on soybeans causes a few problems. First, there is little ground cover with soybean production which leaves the soil vulnerable to erosion. Second, soybean cyst nematode and other diseases like white mold can build up in the soil.
Yes and no. Soybean seed produced in the US is available in different maturity groups based on the latitude in which they are to be grown. Group 0 varieties are bred for production in the far...
If you take a damp paper towel or napkin and put the soybean on it, then fold the paper towel/napkin in half so that the bean is covered, and let it sit for a few days, the bean should sprout.
Soya beans are the seed of the soya plant. The plant grows and then flowers. The flowers are fertilized and the seeds develop in pods like any other bean or pea. Look at this page in Wikipedia...