Q: Mechanical churning of food in what organ serves to further break it apart and expose more of its surface area to digestive juices, creating an acidic "soup" called chyme? Choices: - liver - kidneys - gall bladder - stomach A:
stomach

Q: Root-like projections anchor adults of what colony-dwelling animals to solid surfaces such as rocks and reefs? Choices: - anemones - corals - molluscs - sponges A:
sponges

Q: Q: How many mass distinctions have radically altered the history of life? Choices: - six - one - four - five A:
A: five

Question: Q: What is the type of energy that involves movement? Choices: - molecular energy - thermal energy - light energy - mechanical energy A:
Answer: mechanical energy

*Question*
Q: Electric current is measured in coulombs per second, also called what? Choices: - voltages - joules - watts - amperes A:
**Answer**
amperes

*Question*
Q: During what in the small intestine do rings of smooth muscle repeatedly contract and then relax? Choices: - mitosis - contraction - compression - segmentation A:
**Answer**
segmentation