Q: What paired organs help regulate blood pressure through sodium ion and water retention and loss? Choices: - lungs - tissues - lymph nodes - kidneys A:
kidneys

Q: What are the three most common protective devices? Choices: - fuses , circuit breaks & surge claws - tranistors, resistors & diodes - fuses , fabrication breaks & surge protectors - fuses, circuit breaks & surge protectors A:
fuses, circuit breaks & surge protectors

Q: Q: What kind of lines does a diffraction grating produce? Choices: - nearly spaced lines - properly spaced lines - randomly spaced lines - evenly spaced lines A:
A: evenly spaced lines

Question: Q: What describes how close an estimate is to a known standard? Choices: - hypothesis - frequency - diversity - accuracy A:
Answer: accuracy

*Question*
Q: A major diversification of what animal group occurred about 50 million years ago, possibly spurred by worldwide climate change? Choices: - reptiles - amphibians - insects - mammals A:
**Answer**
mammals

*Question*
Q: What is the most complex organ in the human body? Choices: - heart - liver - muscular - brain A:
**Answer**
brain