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I.  (i) Given vectors v_1= , and v_2 =,  determine their span as a plane in 3-space.  (10 points)  (ii) Is the vector x = in the span of v_1 and v_2? Give reasons for your answer. (5 points) II.  Given the matrix A= ,  (i) find an echelon form for it. (5 points)     (ii) Determine the null-space of A, using the echelon form in (i).  (5 points)     (iii) Determine a basis for the null-space of A. (5 points)

List the four chordate characteristics.

Match the following organisms with the correct descriptions.

Radially symmetrical aquatic invertebrates with stinging cells located on tentacles belong to which phylum?

Predation of a rat by a snake can be categorized as an ______ interaction.

What fungal group does the fungi picture below belong to?  

Characteristics shared by both snakes and birds include:

   What does the dotted line horizontal line at 6 on Y axis represent?

Metamorphosis of bees includes the following stages: egg, larva, pupa, adult.  What type of metamorphosis has just been described?

Which of the following best describes a coelom?