Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases.
There is a U-shaped region called The Fertile Crescent.
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The thermocline describes D) an areas where the temperature of the ocean sharply decreases. These layer is between mixed layer and the deep water layer in the water and is a transition layer in the ocean.
-The main city is located in an isolated state
-It is assumed there are no significant transport infrastructures such as major roads or rivers and that farmers are transporting their production to the market using horses and carts
-The land surrounding the market is entirely flat and its fertility uniform.