During devonian time life transitioned to land. two major divisions of animals moved ashore, first the arthropods and then the tetrapod vertebrates. what fossil evidence best supports the classification of animals into these two basic branches, still recognized today? a)fossilized amniotic eggs b)impressions of scales versus fur eliminatec)evidence of exoskeletons and endoskeletons d)fossilized bones with and without air cavities     d)fossilized bones with and without air cavities

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.

answer; somatic;