The point over which a level is centered is called a
a. station mark
b. transit
c. plumb line
d. point of reference

Explain the popular saying "we are made of stardust. how are we made of stardust? use scientific vocab.

Who pays into social security a employees b self employed c employers d all of the above

Which of the following characteristics would be more important to an organism adapted for life in a marsh than for an organism adapted for life in a river? tolerance for variable ph tolerance for variable salinity tolerance for variable pressure tolerance for variable water velocity tolerance for variable water availability