You can usually recognize when a person is happy just by looking at the expression on their face. this is because happiness is a) a learned emotion b) a defense mechanism c) a coping strategy d) a primary emotion

Zoom out so that you can see the whole state of california. select the ruler tool again, but change the type of measurement from line to path. create a path from san francisco to las vegas, to los angeles, to san diego. what is the total length of this path in kilometers and in meters?