Mr. Silva teaches sixth-grade language arts. At the beginnin…

Mr. Silva teaches sixth-grade language arts. At the beginning of every school year, he spends the first five days of schools setting up rules and procedures. Before school begins, Mr. Silva prepares a list of rules and procedures he wants the students to learn and follow. The first day of class he passes out the list and gives students time to read it. He goes over each rule and procedure with the students and asks for their comments about the fairness of each. May students do comment, and when Mr. Silva feels the comments are justified, he changes or modifies the rule or procedure. When he and the students are satisfied, he begins practicing the procedures with the students. When the students demonstrate knowledge of the classroom procedures, Mr. Silva begins to teach course content. Why does Mr. Silva involve the students in the creation of classroom rules and procedures?

There are four major groups of extant, or living, fishes: th…

There are four major groups of extant, or living, fishes: the jawless fish, the cartilaginous fishes, and the bony fishes.  Although these 3 groups differ considerably, they do share certain features in common. Which of the following features is NOT found in all 3 major groups of extant fishes?