what is the name of the geographical region stretching from central mexico to parts of central america where indigenous people lived for thousands of years until the europeans arrived

There are traits like blood type and eye color, and others like speaking english or having a scar. what are the terms used to describe these different types of traits? how are each defined?

The idea that desirable traits can be bred into human beings and undesirable ones can be bred out is known as:

What is generally true of the lower house in a state legislative branch ?