Q: Where do polychaete worms live? Choices: - lakes - digestive tract - garden soil - the ocean floor A:
the ocean floor

Q: What do ions of the same charge do? Choices: - merge - attract each other - discard each other - repel each other A:
repel each other

Q: Q: What is the phenomenon in which light and sound waves become circular at the point source of a barrier? Choices: - refraction - sonic wave - reflection - diffraction A:
A: diffraction

Question: Q: In studying energy, what term do scientists use to refer to the matter and its environment involved in energy transfers? Choices: - molecule - ecosystem - world - system A:
Answer: system

*Question*
Q: What part of the body do fish use to absorb oxygen? Choices: - dorsal fin - tail fin - under belly - gills A:
**Answer**
gills

Q: What type of protein speeds up chemical reactions in cells? Choices: - hemoglobin - lipids - collagen - enzyme A:
enzyme