What are the body's adverse reaction to introducing an excessive amount of toxic substances in the system?

Jessica said she would never work for less than $12 an hour, but then she got a job looking after children in the afternoon, and it pays only $6 an hour. now she says that money isn't as important as enjoying her work. this is an example of: apex

Why is it important to know first aid/ cpr/ aed?

What do scientist use to map human genome?