- 97% of all the water on the earth is salt water, which is not suitable for drinking.
- Only 3% of all the water is fresh water, and only 1% is available for drinking.
- 2% of the available freshwater sources is locked in ice caps and glaciers.
With growing population rates and such a small percentage of all the water on earth, it only makes sense that we must preserve and conserve this precious resource.
Answer:
Genetic variation is caused by:
mutation
random mating between organisms
random fertilization
crossing over (or recombination) between
chromatids of homologous chromosomes during
meiosis