Lead emission since early 1980s have DECREASE DUE TO LEAD FREE GASOLINE.
Lead is a natural occurring element that is found in small quantity in rocks and soils. Lead emission is an important environmental health issue because a very small quantity of lead can cause adverse effects on the nervous system of unborn babies and young children. Because of this, the government took all necessary measures to ensure that its emission was drastically reduced.
Explanation:
1)
building blocks of Carbohydrates are monosaccharides that are simple sugars
2)amino acids are the building units of proteins there are 20 amino acids found in human body that are building blocks of proteins
3)Nucleotides are the building blocks (monomers) of nucleic acids, DNA and RNA.
The answer you are looking for is Natural Selection.
Image result for What are the processes involved in the nitrogen cycle
The five processes in the nitrogen cycle – fixation, uptake, mineralization, nitrification, and denitrification – are all driven by microorganisms.
The place is called the endosperm