Q: What type of structure between the esophagus and the stomach normally opens only when a bolus arrives? Choices: - larynx - intestine - gland - sphincter A:
sphincter

Q: Warm water from the equator mixes with cold water from where? Choices: - the tropics - the oceans - the continents - the poles A:
the poles

Q: Q: What is it called when two waves in the same medium pass one another? Choices: - accumulation - frequency - synchrony - interference A:
A: interference

Question: Q: A polyatomic ion is an ion composed of more than one what? Choices: - pair bond - neutron - nucleus - atom A:
Answer: atom

*Question*
Q: Arthropods change into the adult form in a process called what? Choices: - parthenogenesis - spontaneous mutation - budding - metamorphosis A:
**Answer**
metamorphosis

Q: Q: What are the two types of endoplasmic reticulum? Choices: - thick & smooth - rough & thin - rough & thick - rough & smooth A:
A: rough & smooth