Question: Which of the following statements is true? A) all chordates are vertebrates B) all chordates...
Question: Which of the following statements is true?
A) all chordates are vertebrates
B) all chordates have dorsal hollow nerve cord (DHNC) at some stage of their development
C) the DHNC becomes the backbone in vertebrates
D) none of the above
Question: Countercurrent flow of water across the gills is efficient because:
A) The water and the blood flow in the same direction
B) the water and the blood flow in opposite directions
C) the water is more saturated with oxygen than the blood
D) the blood is more saturated with oxygen than the water
E) A and C
F) A and D
G) B and C
H) B and D
Please help! they are both multiple choice! thank you
Homework Answers
1. The following statements is true
B) all chordates have dorsal hollow nerve cord (DHNC) at some stage of their development
2. Countercurrent flow of water across the gills is efficient because
G) B and C
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