1. explain why it can be useful for you and your doctors to know your family’s medical history, including information about parents and grandparents. (5 points)

2. what are the possible effects of contaminated water on the health of an individual or community? explain your answer in terms of what causes the contamination, the types of infectious agents involved in the related diseases, and how these diseases can spread. (5 points)

3. describe two types of drugs and the negative impact the abuse of these drugs can have on a person’s health. (5 points)

1. Knowing our family’s medical history can be useful for us and our doctors because it can help to check the possibility of occurrence of genetic disorders.  Genetic disorders are passed on through several generations. Diseases like hemophilia and color blindness are some examples.

2. Contaminated water can negatively affect the health of an individual as well as a community. Pathogens contained in contaminated water causes several diseases. Diseases like cholera and typhoid are examples of water-borne diseases.  

The bacterium that causes typhoid is Salmonella typhi and the pathogen that causes cholera is the bacterium Vibrio cholera. The consumption of water contaminated by the feces of a person infected with cholera cause the spreading of disease to a healthy person. Contaminated water and poor sanitation is the cause of typhoid spread as well.

3. Two types of drugs are stimulants and hallucinogens. Stimulants increase the alertness of the person who uses it and increases the heart rate, blood pumping rate and blood glucose levels. Cocaine is an example of stimulant drug.

Stimulant abuse can lead to anxiety, paranoia, depression etc. hallucinogens disconnect the link to the brain and users experience unstable and rapid emotions and have hallucinating visions.LSD is an example of hallucinogen. Hallucinogen abuse can cause cognition distortions, paranoia, anxiety etc.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.