Q: Where does evidence that magnetic reversals occur come from? Read this paragraph and choose the correct option from the provided answers: Scientists don't know for certain why magnetic reversals occur, but there is hard evidence that they have for hundreds of millions of years. The evidence comes from rocks on the ocean floor. Look at Figure below . They show the same ridge on the ocean floor during different periods of time. Choices: - snow - Volcanoes - air - rocks on ocean floor A:
rocks on ocean floor

Q: Difference in electric potential energy are measured in what basic unit? Read this paragraph and choose the correct option from the provided answers: The difference in electric potential energy is measured with a voltmeter in units called volts. Choices: - moles - watts - knots - volts A:
volts

Q: What do osteoblasts secrete that mineralizes to become bone matrix? Read this paragraph and choose the correct option from the provided answers: Osteoblasts make new bone cells and secrete collagen that mineralizes to become bone matrix. They are responsible for bone growth and the uptake of minerals from the blood. Choices: - spongin - calcium - carbon - collagen A:
collagen

Q: Name the closest living relatives of tetrapods? Read this paragraph and choose the correct option from the provided answers: Choices: - shrimp - spinefishes - lumpfishes - lungfishes A:
lungfishes