<span>A) </span>spur economic development in Africa
B) impede economic development in Africa
C) impede economic development in Europe
D) spur economic growth for those medical professionals
<span>The answer is B. Brain drain means a country is losing its professionals to the external market rather than working in the local market due to unfavorable local conditions. The country loses because it has few medical professionals to treat its people hence it carries a higher burden of diseased people. Additionally, to cater to this gap, it has to import these medical services which is more expensive than keeping local talent. </span>
When coming to building something, some materials are more vulnerable to water and can wear away easier. Some can keep the water in, so depending on the material, the water quality can be better sustained.
Why is the active site specific for only one type of substrate? Enzymes have a lock and key type fit so only a specific substrate fits in the activation site.
