Q: What happens to an animal's telomeres as it ages? Choices: - divide - lengthen - multiply - shorten A:
shorten

Q: Where does digestion begin? Choices: - esophogus - tongue - stomach - mouth A:
mouth

Q: Q: Where are most plants firmly rooted? Choices: - rock - grass - mineral - soil A:
A: soil

Question: Q: Birds have a flow-through respiratory system in which air flows unidirectionally from the posterior sacs into the lungs, then into these? Choices: - posterior bronchi - gills - alveoli - anterior air sacs A:
Answer: anterior air sacs

*Question*
Q: How does the core of the sun radiate energy? Choices: - nuclear fission - carbon radiation - electrical radiation - nuclear fusion A:
**Answer**
nuclear fusion

Q: Q: Which theory describes the distribution of electrons in molecules in much the same way that the distribution of electrons in atoms is described using atomic orbitals? Choices: - molecular distribution theory - atomic orbital theory - atomic distribution theory - molecular orbital theory A:
A: molecular orbital theory