Which selection from the article highlights a substance that has reached a boiling point? (A) This happens when a substance is cooled or heated to a particular point.
(B) For example, heat causes liquid water to evaporate, or turn into water vapor - a gas.
(C) That same temperature can be considered the melting point if the temperature is increasing and causes
a solid to become a liquid.
(D) For example, certain metals turn to rust if they sit out in the rain, and paper and wood burn to ashes if
they touch a flame.

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.

a compound light microscope is used to magnify objects in steps.  

hope it

cuz some people don't have enough food. that's why we need more ppl to donate food to the hungry.