A student investigates how speed changes as a ball travels down a ramp. Measurements taken by computer every second are recorded on a data table. Which diagram will best display the data from this table? OPTIONS:
- a bar graph
- a line graph
- a pie chart
- a pictograph
A: a line graph

Which of the following best describes a change in Earth's atmosphere made by early photosynthetic life? OPTIONS:
- increased level of oxygen
- increased level of carbon dioxide
- decreased ability to support life
- decreased ability to transmit light
A: increased level of oxygen

Sugar is made up of many molecules. When sugar is dissolved in water, what happens to these molecules? OPTIONS:
- They no longer exist.
- They exist in solution.
- They evaporate.
- They combine with water to form new elements.
A: They exist in solution.

Which factor most accurately describes the statement "Survival of the fittest" in relation to natural selection? OPTIONS:
- the mutation rate
- the ability of offspring to reproduce
- the amount of food an organism obtains
- the ability to withstand environmental extremes
A:
the ability of offspring to reproduce