Cleaning up spills, I believe.
Environmental hygiene is improving the basic environmental conditions affecting human health. Examples include: clean water supply, human and animal waste disposal, protection of food from biological contamination, and good housing conditions.
Answer:
There will be an increase in frequency, if there is continuous reproduction within humans with the heterozygous genotype but a decrease if there is a continuous reproduction of heterozygous humans and non-carriers of the allele.
Explanation:
The heterozygous genotype gives an advantage for malaria resistance however, if malaria was completely eradicated and the heterozygous genotypes continue to reproduce within one another, there will be an increased frequency of sickle cell allele. However, if heterozygous alleles were to reproduce with individuals without the allele, there will be a decrease in the frequency of the allele in the human population. If this trend continues, there will be ao less a frequency of the allele that it's presence could be completely lost.
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I think the Choroid is the part with the most blood vessels, found in the three tunics of the eye.
