Imagine a male dragonfly is flying around in an aggressive pattern to find an appropriate mate in a wetland with many species of dragonflies and damselflies. Finally, he spots a female dragonfly that appears to be of the same species, based on her flight behavior and color, and the two mate. The sperm of the male, however, are unable to fertilize the eggs of the female when she lays them because her egg cell membrane proteins and carbohydrates do not recognize and bind to the male's sperm. This is an example of:

b. to discover aspects of the natural world.

hopefully i .

-hails tea

explanation:

-t poses

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.