19. The optimizes airflow, keeps cylinder pressure in a certain range, and determines the engine's operating range. O A. push rod
B. valve timing
C. intake manifold
D. valve lift

Which statements describe continental crust? select the three correct answers. a-it is formed in all parts of the continents. b-it is made mostly of volcanic rock. c-it is destroyed by melting near the top of the mantle. d-it is less than 10 km thick. e-its ages ranges from very young to more than 4 billion years old.

Identify one similarity between china and europe that explains their decisions on wether to explore or conquer lands around the indian ocean

Symptoms of include nausea, vomiting, improper digestion, and severe abdominal pain, and sufferers may develop diabetes. a. pancreatitis b. hepatitis c. gastritis d. none of the above