Help please! Will give brainliest.

the diagram shows the body structures that are similar though in different species due to common ancestry, this evidence is comparative anatomy.

The diagram shows that they have homologus structure.  All of these different species have the same bones but differnt fuctions like swimming vs flying. They show that we call came from a common ancester because we have similar structures even though they are differnt species.

Explanation:

. ph changes the ability of them he enzyme to dissolve in water.

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.