21. What is a distinctive feature of the chondrichthyans? (A) an amniotic egg. (B) unpaired fins. (C) an acute sense of vision that includes the ability to distinguish colors (D) a mostly cartilaginous endoskeleton

2. Genetically engineered plants (A) are more difficult to engineer than animals. (B) include a transgenic rice plant that can help prevent are more difficult to engineer than animals t vitamin A deficiency. (C) are being rapidly developed, but traditional plant breeding programs are still the only method used to develop new plants. (D) are able to fix nitrogen themselves

21. What is a distinctive feature of the chondrichthyans?
(A) an amniotic egg.
(B) unpaired fins.
(C) an acute sense of vision that includes the ability to distinguish colors
(D) a mostly cartilaginous endoskeleton

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