Which describes a scientist being creative?

joshua takes detailed notes about the experiment he is conducting.
elyse reads the references of a study before believing it.
sara tries turning a test tube upside down to collect a gas.
levi asks if redwoods would grow even taller if they had more phosphorus.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.