Question

an unknown organism has a closed circulatory system, breathes with lungs, has a backbone, and is able to move from place to place. this description may be applied to which of the following organisms?
i. earthworm
ii. human
iii. beaver
iv. fish
oa. i and iii
ob. ii and iii
oc. i, ii, and iii
od. ii only

Explanation:

• Earthworm (Ⅰ): It has a closed circulatory system but breathes through its skin, not lungs.
• Human (Ⅱ): Has a closed circulatory system, breathes with lungs, has a backbone (vertebrate), and can move.
• Beaver (Ⅲ): Has a closed circulatory system, breathes with lungs, has a backbone (vertebrate), and can move.
• Fish (Ⅳ): Has a closed circulatory system but breathes with gills, not lungs.

Answer:

B. Ⅱ and Ⅲ