The cells of many bacterial species have the ability to differentiate (sometimes permanently) for purposes that enhance species survival in various ways. Such differentiation is typically accompanied by major changes in gene expression or cell structure. Which of the following represents a differentiated cell type? There are at least two correct answers. Choose one or more: A. Anabaena heterocyst B. Bacillus endospore C. flagellated Pseudomonas D. Caulobacter with holdfast E. Staphylococcus cluster F. Streptomyces aerial hyphae G. E. coli siderophore

The bacteria that represents differentiated cell type is  called Bacillus endospore

Explanation:

This bacteria have a special ability to live long in dormant form as their endospore  remain viable for thousand of year.

They form endospore through a process called as Sporulation.

This sporulation requires many steps-

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.