*Question*
Q: What are indestructible and constantly in motion? Choices: - viruses - crystals - ions - atoms A:
**Answer**
atoms

*Question*
Q: Which process helps absorptive protists absorb food molecules across their cell membranes? Choices: - activation - secretion - metabolism - diffusion A:
**Answer**
diffusion

*Question*
Q: Many countries have attempted to reduce the human impact on climate change by reducing their emission of what greenhouse gas? Choices: - methane - acid dioxide - nitrous oxide - carbon dioxide A:
**Answer**
carbon dioxide

*Question*
Q: What are physical properties that do not depend on the substance present called? Choices: - extensive properties - multilateral properties - internal properties - intensive properties A:
**Answer**
intensive properties