Contaminated lands and environments cause health difficulties such as cancer, can effect the respiratory system, and problems on the skin.
Firstly, we need to know what a healthy ecosystem is. When an ecosystem is healthy, this would mean that it could supply all the resources that all organisms present in it and with all the resources, there is diversity. Old growth forests are considered healthy because of this reason. These forests remain untouched and had remained in providing the resources needed for the organisms present in it.
Genetic selection is the process by which certain traits become more prevalent in a species than other traits. These traits seen in organism are due to the genes found on their chromosomes. Figure 1 allies 4 genes are inherited income in various forms. Genes have more than one version or allele.
There are four main groups of macromolecules:
1. Nucleic acids (DNA and RNA)-monomers are nucleotides; provide genetic information
2. Proteins-monomers are amino-acids; structural, catalytic, regulatory roles
3. Lipids (fats)-monomer units are free fatty acids; structural, energy, insulation roles
4. Carbohydrates (sugars)-monomer units are monosaccharides (like glucose); energy source, structural function.
