Which kingdom includes autotrophic and heterotrophic, unicellular and multicellular organisms?

Protista  Kingdom

Explanation:

Protista consists of simple eukaryotic organisms that are made up of a single cell or composed of group of similar cells that can sustain in any environment terrestial, moist , water, as parasites, etc.

Plant like protists such as algae are able to produce food of their own while heterotrophic species such as fungis (slime molds) feed on decaying dead organic matter.

Hence, kingdom protista  includes autotrophic and heterotrophic, unicellular and multicellular organisms.

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.