Q: The fujita scale measures the intensity of what weather event, based on wind speed and damage? Choices: - sandstorm - wind gust - blizzard - tornado A:
tornado

Q: The first period of the paleozoic era was called what? Choices: - carboniferous - permian - ordovician - cambrian A:
cambrian

Q: Q: What does increased temperature cause the volume to do in a gas? Choices: - disappear - decrease - halve - increase A:
A: increase

Question: Q: How many pairs of chromosomes are found in human cells? Choices: - 25 - 24 - 13 - 23 A:
Answer: 23

*Question*
Q: What hypothesis states that the biosphere is its own living organism Choices: - the seager hypothesis - Big Bang theory - small world theory - the gaia hypothesis A:
**Answer**
the gaia hypothesis

*Question*
Q: Rupture or blockage of arteries in the head is the usual cause of what condition? Choices: - heart disease - migraine headache - heart attack - stroke A:
**Answer**
stroke