What structures do microalgae elodea maple leaf and root hair have in common

They have a nucleus, vacuole, cell wall and membrane.

Explanation:

microalgae elodea maple leaf and root hair are eukaryoti organisms and they have nucleus, cell wall and membrane in common and these structures perform different functions.

Nucleus is a membrane bound organelles that contain the DNA or genetic material . It is majorly found in eukaryotic organisms.

Vacuole is a membrane bound organelles that function in digestion, ingestion, excretion of waste and storage.

Cell wall is a structure that give shape, support and protection to cells.

Membrane is a structure that separate the internal of the cell from it outside environment and it give protection to the cell..

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.

if you listed your answers right then i believe your answer is b.