Researchers have identified approximately neurotransmitters.

The answer is more than 100, because base on the research, they have identified more than 100 of the neurotransmitters to be belong in the five groups and they are namely the following, gases, biogenic amines, amino acids, acetylcholine and neuropeptides.

the reason the welfare system causes so much of a burden on its recipients is because the welfare system does not give its recipients any real tools to actually get out of poverty. the welfare system has embedded poverty deeper into society and has made it harder and harder for people to escape poverty.

in other words, it stoped the poor, and now its making it worse.

hope this . : )      

and im sorry it took so long for your question to get answered

countries such as spain, france and portugal colonized the region. although most of latin america was colonized by spain, the countries of portugal and france also had major influences on the region. due to war and disease, native populations were decimated.