Use the following scenario for questions 1 - 4. A 61.0 kg grocery cart is sitting at rest. In order to change the cart's state of motion, Xavier must
apply 72.1 Newtons of force on the cart.
After 10 seconds, the cart has achieved a velocity of +3.62 m/s. Xavier is still applying 72.1 N of
force on the cart.

when it is at an intermediate population density

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.