It is because the “building” word that denotes infrastructures is a gerund. Gerunds are nouns that came from verbs + a suffix “ing". So in this case, “building” comes from the verb “built" (which implies that something is already done building something) + the “-ing”.
B. agility is a skill related component of fitness.
The diabetes factor is held in the dominant genes.
You can have a dominant gene that is connected to diabetes, and yet still not get it, but overall it's dominant.
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Thymus
Thymus is one of the primary lymphoid organs which provides the site for maturation of T-lymphocytes or T-cells
