Q: What occurs when the immune system attacks a harmless substance that enters the body from the outside? Choices: - panic attack - nausea - plague - allergy A:
allergy

Q: What are the parts used in electronic devices such as computers called? Choices: - batteries - digital components - chargers - electronic components A:
electronic components

Q: Q: What is the simplest life cycle? Choices: - diploid life cycle - binary life cycle - metamorphic cycle - haploid life cycle A:
A: haploid life cycle

Question: Q: Two or more what may bond with each other to form a molecule? Choices: - particles - clouds - quarks - atoms A:
Answer: atoms

*Question*
Q: The average number of individuals per unit of area can be expressed as what? Choices: - the percent of population - percent density - total density - population density A:
**Answer**
population density

*Question*
Q: Vibrating electric and magnetic fields make up what kinds of waves? Choices: - seismic - eletrical - mechanical - electromagnetic A:
**Answer**
electromagnetic