Principles of BLOA

There are four principles that define the Biological Level of Analysis. At least, there are according to Meltzer. The Internet says it's three. But Meltzer is probably a lot more reliable.
The four main principles are (non-verbatim):
# Behavior is the product of biological processes from the nervous and endocrine systems
# Animal research may inform our understanding of human behavior
# Patterns of behavior are based on evolution
# Patterns of behavior are based on genetic makeup
Because the BLOA assumes that all behavior is a result of biological factors, these four principles allow us to look at it in a more well-defined way.