Because people decide not to have many children because the economy is bad and without money they wont be able to provide for their family.
yes they have become many things including becoming mental
Most Definitely
For some system you do - although nowadays these are becoming rarer.
it is a families family like a tribe but smaller
In the past, families farmed for their own food. Nowadays it is just farmers and crop people who do it.
Humans as a race are becoming smaller in relation to all insects. We are also becoming heavier & women less curvy.
They have got smaller. There are a lot more single parent families and families where the parents are not married.
You probably mean diminution - making things smaller, or simply the action of becoming smaller.
they were people who broke in to smaller band families homes
conditions in cities often discouraged couples from having large families
means that your disc is becoming smaller and smaller (compressed) and that there are fragments of bones on your vertebrates
Mexico is reaching a demographic transition, where families tend to be smaller. Nowadays most families in Mexico are composed by both parents and one up to three children. Current fertility rate is 2.27 children per woman (2015 est.)