Human,increase population and Overharvesting
While states have been relatively effective in stopping <u>The depletion of the ozone layer </u> they have been less successful at stopping <u>Global climate change.</u>
Countries all across the globe decided to stop using ozone-diminishing compounds in order to protect the ozone layer from depleting.
The Vienna Convention for the Protection of the Ozone Layer in 1985 and the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987 formalized this accord.
Ozone shields the Earth from the Sun's damaging ultraviolet (UV) radiation. Life on Earth would be extremely difficult without the Ozone layer in the atmosphere.
Plants and planktons, which provide sustenance for the majority of ocean life, cannot survive and thrive in high UV exposure.
Learn more about to<u> </u>Global climate change.<u> </u>visit here;
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Answer:
properties cell membranes
<span>Cells control cell division in order to maintain normal cell function. If something happens to the control of the cell division, the healthy cells will divide uncontrollably. These new cells are cancer cells. </span>
The mutations in three genes are responsible for development of cancers:
1. Mutation in proto-oncogenes. Proto-oncogenes normally signal cells to grow and differentiate. Proto-oncogenes can become oncogenes due to mutations which result in the uncontrollable division of the cells.
2. Mutation in tumor suppressor genes. In normal cells, tumor suppressor genes suppress genes essential for cell cycle and that way they prevent uncontrollable cell division. However, after a mutation in these genes, suppression is lost and the cell may progress to cancer.
3. Mutation in stability genes. In normal cells, they have no role either in cell death or growth, but they control mutation rate. Mutation in stability genes results in situation where all genes, including proto-oncogenes and tumor suppression genes, are more frequently mutated.
