Residents of 4 small towns with 4 different types of water supply were asked to participate in a study to identify cholera carriers. Because several cholera deaths occurred recently, virtually everyone present at the time underwent examination. The proportion of residents in each small town who were carriers was computed and compared. What is the proper classification of this study design? a. case-control study
b. cohort study
c. case series
d. randomized controlled trial
e. cross-sectional study

the match duh

explanation:

light dependent reactions:

light independent reactions:

hope this !

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.

it's false. hope i .