gives the background and purpose of an experiment.
Explanation:
Science can be defined as a branch of intellectual and practical study which systematically observe a body of fact in relation to the structure and behavior of non-living and living organisms (animals, plants and humans) in the natural world through experiments.
The introduction in a science text gives the background and purpose of an experiment.
hhj is fine I love the sunset and I have a X of speech to say I am a bit more yo than you I love it so wt tell you what you can do to me and you will never late a