it best say protection properties offered sea walls along coasts

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It is best to say that the protection to properties offered by sea walls along coasts _______.   
a. decreases the present and future risk to human properties
b. increases both the present and future risk to human properties
c. decreases the present but increases the future risk
d. increases the present but decreases the future risk

the answer is:

a. decreases the present and future risk to human properties

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A seawall (or ocean divider) is a type of beach front barrier developed where the ocean, and related seaside forms, affect straightforwardly upon the landforms of the drift. The reason for an ocean divider is to secure regions of human residence, preservation and recreation exercises from the activity of tides, waves, or tsunamis. As a seawall is a static component it will struggle with the dynamic idea of the drift and hinder the trading of dregs amongst arrive and sea. The shoreline is a piece of the waterfront interface which is presented to an extensive variety of erosional forms emerging from fluvial, aeolian and earthbound sources, implying that a mix of denudational procedures will conflict with a seawall

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