Question

scientists focus their research and testing on their area of expertise. for example, astronomers may interpret satellite images, biologists may observe the effects of environmental changes on organisms, and geologists may measure tectonic plate boundary movement. there are several differences between these scientists. however, there are also similarities. how are all scientists similar?
all scientists pursue explanations about the natural world.
all scientists use controlled experiments to determine the relationship between variables.
all scientists test variables in a laboratory setting.
all scientists use expensive equipment.

Explanation:

The fundamental goal of all scientists is to understand and explain aspects of the natural world. Not all scientists use controlled experiments (e.g., some astronomers rely on observations), not all test variables in a lab (ecologists study in the field), and not all use expensive equipment.

Answer:

All scientists pursue explanations about the natural world