Which of the following statements about arthropod exoskeletons is false?

Biomineralization is a costly process that has evolved in many groups of animals, many at approximately the same time period.  Explain 2 circumstances that may have favored the evolution of biomineralization in spite of its costs. 

Discuss the process of movement in earthworms. Use all of the proper terminology discussed in lecture in describing the process. Also, describe a typical earthworm habitat and what adaptations earthworms have to excel in these habitats.

Please use the correct scientific terms. This animal belongs to the phylum and the class . Its hard part is composed of the mineral and the primary biological component

In contrast to neuron~neuron synapses, the arrival of one action potential at the end of the axon of a neuro~muscular junction always results in the production of an action potential in the muscle cell membrane. Answer BOTH of the following questions. Describe 2 anatomical characteristics of a neuro~muscular junction that are different from a neuron~neuron synapse.  For each anatomical characteristic, briefly explain how that feature helps ensure that one axon action potential results in a muscle cell action potential. 

Suppose the country of Kansarado imposes a $4 tariff on every unit of aluminum imported from the world market. The graph of the domestic supply and demand, and the world market, is below.  How much does producer surplus change after the imposition of the tariff? Tariff 3.png

In constant cost industries, does demand have any effect on price in the long run?

Consider the graph representing the domestic supply and demand for steel and the world supply for steel for the country of Kansarado. Suppose Kansarado has free trade.  How much quantity of steel does Kansarado import from the world market? Basic identifiction international trade.png 

Which of the following jobs is attempting to correct for an externality?

In the market for automobiles, the private benefit of one more small SUV is $45,000 and the social cost of one more small SUV is $65,000. Does one more small SUV present an external cost or an external benefit to society?