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Vladimir [108]
3 years ago
11

Two human activities that could contribute to the introduction of invasive species.

Biology
1 answer:
valentinak56 [21]3 years ago
3 0

Answer:

Invasive species or alien species is the term referred to the organisms which are introduced in an ecosystem due to man made or any environmental activity. Humans play primary role in the introduction of invasive species in a certain ecosystem.

Explanation:

These activities may include the ships and boats flowing in aquatic regions of the world that carry novel aquatic organisms in their ballast water and propellers respectively. The small insects present into their shipping pallets and wooden parts are carried from one place to another place where they cause threat for the availability of food and nutrients to the already existing populations.

Another human activity that can contribute to the introduction of invasive species is the enhanced fuel consumption which leads to environmental pollution around the globe. This environmental pollution gets so immense in some areas that it can make the survival of existing species difficult and thus they move to new location for their survival.

Therefore, it can be seen that human activities have potential role in the spread and introduction of invasive species.

Hope it helps!

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As an epidemiologist you are going to investigate the effect of a drug suspected of causing malformations in newborn infants when the drug in question is taken by pregnant women during the course of their pregnancies. As your sample you will use the next 200 single births occurring in a given hospital. For each birth a medication history will be taken from the new mother and from her doctor; in addition, you will review medical records to verify use of the drug. [N.B.: These mothers are considered to have been followed prospectively during the entire course of their pregnancies, because a complete and accurate record of drug use was maintained during pregnancy.] The resultant data are: Forty mothers have taken the suspected drug during their pregnancies. Of these mothers, 35 have delivered malformed infants. In addition, 10 other infants are born with malfunctions. What is the relative risk between exposure to the drug and malformations?

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Explanation:

  • The relative risk is a measure that is used to calculate or compare the likelihood or the chance that an event would occur while comparing the two groups.
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  • The value of relative risk is always either zero or greater than zero but it cannot be negative.
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