Q: Atoms of the same element that have different masses are called what? Choices: - variations - radioactive - mutations - isotopes A:
isotopes

Q: The ancient greek philosopher aristotle thought that all matter consists of just four what, which he identified as earth, air, water, and fire? Choices: - ingredients - structures - compounds - elements A:
elements

Q: Q: What purpose does the appendix serve in humans today? Choices: - work - filters blood - digests food - none A:
A: none

Question: Q: An obstacle or opening that is shorter than the wavelength causes greater diffraction of what? Choices: - tides - ranges - particles - waves A:
Answer: waves

*Question*
Q: Ions are charged what? Choices: - molecules - protons - isotopes - atoms A:
**Answer**
atoms

Q: Q: The first consumption of breast milk or formula floods the baby's gastrointestinal tract with what? Choices: - hemoglobin - nerves - enzymes - beneficial bacteria A:
A: beneficial bacteria