The distribution of sunlight
Answer:
Is the trade of humans for the purpose of forced labour
I believe that the answer to your question would be A. Heart Begins.
Explanation:
Spillover infection, also known as pathogen spillover and spillover event, occurs when a reservoir population with a high pathogen prevalence comes into contact with a novel host population. The pathogen is transmitted from the reservoir population and may or may not be transmitted within the host population.