Q: The complete combustion of alkanes to carbon dioxide is an extremely __________ reaction. Choices: - hydrolic - geothermal - reactive - exothermic A:
exothermic

Q: The processes of homeostasis and temperature control are centered in the hypothalamus of the advanced animal brain, thus thermoregulation depends on what organ system? Choices: - circulatory system - digestive system - cardiovascular system - nervous system A:
nervous system

Q: Q: Which type of galaxies contain very little gas and dust, are red to yellow in color, contain over a trillion stars and have mostly old stars? Choices: - blue elliptical galaxies - giant orbital galaxies - giant gaseous galaxies - giant elliptical galaxies A:
A: giant elliptical galaxies

Question: Q: What types of bonds hold together positive metal ions and their valence electrons? Choices: - ionic bonds - covalent bonds - toxic bonds - metallic bonds A:
Answer: metallic bonds

*Question*
Q: What covers the body of a fish to help the move their body to swim? Choices: - gelatin - skin - hairs - scales A:
**Answer**
scales

(Question)
Q: What is a rock exposed to if it's undergoing metamorphism? Choices: - humidity and pressure - gravity and precipitation - time and energy - heat and pressure A:
(Answer)
heat and pressure