Why are the gases in the troposphere layer denser than the gases in the other layers?

Which of the following is an example of a parasite?

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.