External stimulus. The rain is something out of your control while you're waiting. Rain is not something you are doing nor is it a response to you waiting for the bus.
Answer:
C
Explanation:
In BP, an autoantibody binds to a component of the skin that holds the dermis and epidermis together, causing separation of these two layers, thus forming a blister.
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In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of residues that form temporary bonds with the substrate (binding site) and residues that catalyse a reaction of that substrate (catalytic site).
Answer:
Soil is a natural resource that can be categorised into different soil types, each with distinct characteristics that provide growing benefits and limitations. ... Soil can be categorised into sand, clay, silt, peat, chalk and loam types of soil based on the dominating size of the particles within a soil.
Explanation:
