Melissa proposes to collect classroom observations of troublemaking behavior and observations of aggression on the school playground. The observational ratings will be made by the children's teacher, who will also observe playground aggression. Melissa should be concerned about .

the fact that she only has one data type represented in her research.She should plan to collect some S-or L-data.

Explanation:

c.it was a major banking and commerce center.

d.leonardo da vinci

d. to fix corruption and problems in the catholic church

d. to reform the catholic church from within

a. human faces are presented in an idealized, spiritual manner.

answer; earthquake;