Q: What is the time interval required for one complete wave to pass a point called? Choices: - cycle - minute - half-life - period A:
period

Q: What are the most numerous organisms in the world? Choices: - reptiles - jellyfish - primates - insects A:
insects

Q: Q: What serves as a first responder to pathogenic threats that bypass natural physical and chemical barriers of the body? Choices: - cells immune system - super immune system - immense immune system - innate immune system A:
A: innate immune system

Question: Q: Much of the iron produced is refined and converted into what? Choices: - plastic - wood - sugar - steel A:
Answer: steel

*Question*
Q: Birds have evolved a respiratory system that enables them to fly. flying is a high-energy process and requires a lot of this? Choices: - weight - nitrogen - adaptation - oxygen A:
**Answer**
oxygen

*Question*
Q: What kind of current flows in just one direction? Choices: - physical current - slow current - Alternating current - direct current A:
**Answer**
direct current