Which choice best describes sister taxa to rotifera? platyhelminthes?

What is the cause of their extinction

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities

10. problems and applications q10 consider public policy aimed at smoking. studies indicate that the price elasticity of demand for cigarettes is about 0.2. if a pack of cigarettes currently costs $5 and the government wants to reduce smoking by 10%, it should increase the price by % . if the government permanently increases the price of cigarettes, the effect on smoking 1 year from now will be than the effect 5 years from now. studies also find that teenagers have a higher price elasticity of demand than do adults. which of the following statements are consistent with this result? check all that apply. it is legal for adults to consume alcohol, so many choose to spend their money on that good rather than cigarettes. teenagers do not have as much income as adults, so they are more price sensitive. adults are more likely to be addicted to cigaret