What is a possible cause for a decrease in ecosystem productivity?

a.

an increase in the biodiversity of the ecosystem

b.

a decrease of the biodiversity of an ecosystem

c.

the biodiversity of an ecosystem experiencing no change

d.

an ecosystem becoming more stable

Which instance of political expression would be considered symbolic speech? a. a student wearing all black to call attention to political issues b. a candidate for congress giving an interview to the media c. a demonstrator chanting anticorporate slogans outside a company’s headquarters d. a local citizen speaking up at a town hall meeting