You noticed that the CO2 levels increased over time in the respiration chamber and the O2 levels decreased over time in the respiration chamber. Why did you observe that?

Afew buddies come over to your house to hang out. they notice you're struggling in school, perhaps you have to rely on to pass your class, but you can't absorb the knowledge. they could positively reinforce getting a tutor and working with you, dedicating more time to the areas of struggle and less on hanging out to better yourself.secondly, say you're the victim of bullying. you're afraid to tell an adult because of possible repercussions from the bully himself. your friends encouraging you and pushing you towards telling an adult for your safety is another example. 

So you and your partner don’t get sexually transmitted diseases and so your partner doesn’t get pregnant