How many optional attributes does the following entity type have?

Which of the following could conceivably be entity types on an ER diagram? Select all that apply. 

From the diagram below, indicate how many Cities does a Conductor correspond to. You can infer this even though there is no direct relationship between these entity types.

Based on the following diagram, what is the number of optional attributes in the two entity types? Consider the implicit and explicit ones.

For word recognition, what should be used as a last resort? 

According to Graves, learning new words that represent new concepts is the most difficult word-learning task students face. 

It’s important for struggling readers to have materials at their grade level not their reading level. 

The most productive method for building vocabulary is _______________. This requires no special planning or extra effort. 

Match the pedigree to the correct inheritance pattern (5 pt)

Three Mechanisms of Hypothalamic Control Over Endocrine Function: Please match the number with the name of the correct structure identified in this process.