Two pool (billiard) balls collide, causing each to move in a different direction. Eventually, both come to a stop. The most important factor in causing them to stop is OPTIONS:
- balance.
- friction.
- gravity.
- size.
A: friction.

New carpet is being measured for a room that is 5.5 m by 4.6 m. On a measuring tape, what is the smallest unit that is necessary to measure the room accurately for the carpet? OPTIONS:
- millimeters
- centimeters
- meters
- kilometers
A: centimeters

What may form as a direct result of a star collapsing? OPTIONS:
- constellation
- galaxy
- protostar
- supernova
A: supernova

In eukaryotic organisms, interaction between which organelles is most important for cell shape, tensile strength, and communication between cells? OPTIONS:
- cytoskeleton and cell membrane
- cytoplasm and Golgi apparatus
- nucleus and endoplasmic reticulum
- ribosome and central vacuole
A:
cytoskeleton and cell membrane