The exoskeleton has been both a and a hindrance in the evolution of arthropods. which of the following statements is not true about the exoskeleton? select one: a. arthropods are extremely vulnerable while moulting their exoskeleton b. arthropods exoskeletons are composed of chitin c. arthropods can be larger in the water than on land because they do not have to support the entire weight of their exoskeleton d. like the bones of humans, the exoskeletons of arthropods produce blood cells

explanation:

idk

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.