An electrician wants to take the primary voltage, 12V, of a transformer down to 6V. His secondary coil has 250 turn how many turns should the primary coil have?

Part 4: Essay Question (Select 1, 20 points). Please select ONE of the following questions and answer all parts in the box provided.  PLEASE INDICATE WHICH QUESTION AND SECTION OF THE QUESTION THAT PART OF YOUR ANSWER DEALS WITH. Please use detailed examples in your answer and answer appropriately for the points allotted. 1. Reproductive isolation: a.  How common is reproductive isolation among species in the natural world (i.e., without direct human intervention)? (5 points) (note:  this is asking about reproductive isolation which is in essence the opposite of hybridization)b.  Is reproductive isolation more common in plants or animals? Describe your answer in terms of an evolutionary explanation for why it might be more common in one than the other (3 points)c.  Answer ONE of the questions below (12 points): i.  In Chapter 11, we discussed behavioral isolation as a mechanism for maintaining existing species barriers as well as beginning the isolation process for speciation (evolution of new species). Describe the studies that were done by the Grant’s research team to understand behavioral isolation in relation to the mating patterns of finches. How do these results help us to understand the speciation event observed in medium ground finches (Grant and Grant 2009)? OR ii.  In 1966, Lewontin and Birch presented an example of rapid range expansion in the Mediterranean fruit fly. From the 1850’s to the 1950’s, this species moved from the Australian rainforest across the Australian continent. As they moved from warmer to cooler weather, they adapted quickly allowing them to expand their range. What hypothesis has been presented for how this rapid range expansion occurred? How well supported is this hypothesis?     2. Understanding speciation and adaptation:  a.  Discuss the three major steps in the process of speciation.  Given what you know about this process, what step in the process of speciation do you think the finches on Daphne are in? Defend your answer. (10 points total (6 points for steps, 4 points for finches)).  b. How do Dr. Dolph Schluter’s studies with sticklebacks separate out the two competing hypothesis for species distributions and explain the differences that we see today among both the sticklebacks and the finches (i.e., the hypothesis of competitive exclusion versus the random colonization hypothesis)? Be sure to describe each hypothesis in your answer and discuss the contribution of the different types of studies. (10 points)  

Part 3 (Synthesis): Essay Question (1 question, 20 points). Answer ONE of the following questions in the box provided. PLEASE INDICATE WHICH QUESTION YOUR ANSWER ADDRESSES.  Please use full essay format with Introduction, body and conclusion.  Please use detailed examples and answer appropriately for the points allotted.   1.      Does evolutionary theory provide the answer to the origin of new species? Why or why not? Be sure to provide examples of evolutionary studies in your answer (direct and indirect) and discuss the possible routes that have been proposed as mechanisms of speciation. (Be careful, this is not asking about the origins of all life, just one species emerging from another). 2.      “The apparent fixity of species once seemed to be the greatest argument against evolution” (Weiner 1995). How is the fluidity of species we have been discussing an argument in support of evolutionary theory? Be sure to provide examples of evolutionary studies to support your answer. 3.      Irreducible complexity is a primary argument against evolution. In fact, Darwin himself posed the question ‘How do we explain something as complex as an eye or as ornate as the peacocks feather?’ What is meant by the concept of irreducible complexity and how would you with your new found knowledge of evolutionary biology challenge this idea and describe how selection might lead to these complicated structures. Be sure to provide examples of evolutionary studies to support your answer.  

How can insurable interest be proven in an automobile policy?

cumulative The Kb of a monoprotic, weak base is 5.7*10-4. What is the equilibrium hydroxide concentration of a 1.3 M solution of the weak base? Use the small-x approximation if possible. Answer in M. Do not type units. Do not use scientific notation.

What is the primary purpose of fading a token economy?

Frank presents with poor posture; increased kyphosis, posterior tilt and rounded shoulders.  This limits his full shoulder flexion during functional activities. Which postural interventions would be best to address this (Select 3)

What is the wave speed of a wave with wavelength  7 m and frequency of 450 Hz?

cumulative A container holds a gas at 32 atm. The equilibrium concentration of dissolved gas is determined by spectroscopy to be 0.24 M. What is the Henry’s Law constant of the gas? Answer in M/atm. Do not type units. Do not use scientific notation.

What is K for reaction 3 given the following data? Table of Reactions and Equilibrium Constants Reaction Number Reaction K 1 Cd(NH3)42+(aq) = Cd2+(aq) + 4NH3(aq)  2.4*108 2 CdF2(s) = Cd2+(aq) + 2F-(aq) 3.5*106 3 Cd(NH3)42+(aq) + 2F-(aq) = CdF2(s)  + 4NH3(aq) ? Do not use scientific notation.