Iodine solution is used to test leaves for the presence of starch. You need to: heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions) heat it in boiling ethanol for a few minutes (this removes most of its colour)
This would be an example of classical conditioning. This is almost exactly what Pavlov did with his dogs.
<span>B.
Teens are more vulnerable to contracting an STI because their bodies are less developed than adults.</span>
Answer:
true . . . . . . . . . . .. . . . . . . . . . . . . . . . . .
