Amortgage that covers several parcels of land and contains a provision that allows for the sale of an individual parcel with clear title is called:

Blanket mortgage

Explanation:

A blanket mortgage  is defined as mortgage which is funded for buying multiple real estate property area. This is also known as blanket loan. In this scenario,a developer can use blanket mortgage instead of using single mortgage for sub-divided property

These loans are usually taken by developers and builders for a particular real estates property which is divided into pieces for selling them individually one by one or any certain time.  

d is the correct answer.

b is incorrect because it makes food by itself

c is incorrect because us humans don't know how to produce their own food using the sun like plants.

a is incorrect because consumers can depend on carnivores for eating food for consumers to eat the dead organism. same thing with omnivores.

answer; dead end or culdesac;