Which of the following descriptions of the surface area of a maple-tree leaf best explains the relationship of structure to function?
A. The surface-area-to-volume ratio of the leaf is very low to
minimize loss of water.
B. The surface-area-to-volume ratio of the leaf is very low to
maximize photosynthesis.
C. The surface-area-to-volume ratio of the leaf is very high to
minimize waste elimination.
D. The surface-area-to-volume ratio of the leaf is very high to
maximize CO2 intake.

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.

what is this saying?

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.