This cockroach is an insect, and the dog is a mammal. Insects and mammals both have structures that support their bodies. What is a major difference between these structures? F. Insects support their bodies poorly, and mammals do it well.
G. Insects’ support structures are in their heads, and mammals’ are in their bodies. H. Insects have mainly external support, and mammals have mainly internal support.
I. Insects leave behind their support structures when they move, and mammals keep theirs

the answer is h

Explanation:

honestly I dont even know how I just remember

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.

c is the correct answer!