Bacillus anthracis can cause infection via three different portals of entry. the id50 of cutaneous anthrax is 10 to 50 endospores, while inhalation anthrax requires 10,000 to 20,000 endospores, and gastrointestinal anthrax requires 250,000 to 1,000,000 endospores. which statement best describes a conclusion that can be drawn based on this information?

-Exposure to a small number of endospores (fewer than 1000) is most likely to result in gastrointestinal anthrax.

-Cutaneous anthrax is rarely observed when cases across the population are monitored

-The portal of exit impacts the infectious dose needed to cause infection at the portal of entry.

-Equal numbers of cutaneous, inhalation, and gastrointestinal anthrax infections are observed in human hosts.

-It is significantly easier to be infected with cutaneous anthrax as compared to other forms of anthrax.

Explanation:

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. ph changes the ability of them he enzyme to dissolve in water.

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.