Ateam of scientists are studying three different layers of sedimentary rock to learn about a particular reptile species. in the layer of rock that is closest to the earth's surface, the reptiles' teeth fossils are found to be short and straight. in the layer below, the reptiles' teeth fossils are found to be long and straight. in the layer below that, the reptiles' teeth fossils are found to be long and curved. based on this information, the reptiles today most likely have

The answer is short, straight teeth.

Sedimentary rock forms in layers over time. As time passes, new layers form upon the older layers. This means that as time passes, fossils are buried deeper and deeper in the ground. Therefore, fossils found in higher layers of sedimentary rock are newer than fossils found in lower layers of sedimentary rock.

Since the layer of sedimentary rock that is closest to the Earth's surface contains short, straight teeth fossils, the reptile species is most likely to have short, straight teeth today.

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.