Which activity causes the least amount of wetland and estuary degradation when it occurs near the coast? A. dune grass rehabilitation
B. hydrologic alterations
C. agricultural development
D. urbanization and land development

The activity which causes the least amount of wetland and estuary degradation when it occurs near the coast is:

A. dune grass rehabilitation

Explanation:

This is actually a rehabilitation effort, unlike the other three options that cause land degradation.  A dune grass rehabilitation accretes sand and minimizes the rates of beach erosion. The program tries to protect coastal infrastructure and upland properties from storm damage by planting vegetation, fencing off sensitive areas, blocking storm surge, creating dune walkways, and absorbing wave energy.  During dune grass rehabilitation, activities that adversely affect the dunes are avoided.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."