Animals with closed circulatory systems are more successful than animals with open circulatory systems.

Question

Answer the following statement true (T) or false (F)

Answer 1

False

Clarify Question
• What is the key concept addressed by the question?
        o This question is asking about the relationship between closed circulatory systems the success of a species.
• What type of thinking is required?
        o You are being asked to take what you already know and use, or apply, it to the idea of success as a species.

Gather Content
• What do you already know evolutionary success? What other information is related to the question? 
        o The evolutionary success of a species is related to its current existence, the duration of its history of a species, and the abundance of the species over time.
        o Open circulatory systems have a beating heart and some blood vessels, but the blood eventually enters an open space in which it bathes the tissue directly.
        o In a closed circulatory system, the red blood cells do not leave the blood vessels under normal circumstances.
        o In a closed circulatory system the blood is moved directly to individual tissues, so the efficiency of oxygen delivery is increased.
        o Since the vascularization in a closed circulatory system is more extensive than that which occurs in an open circulatory system, a closed circulatory system can be considered more complex.

Choose Answer
• Given what you now know, what information is most likely to produce the correct answer?
        o While the increased efficiency of a closed circulatory system does make larger body size possible, greater body size does not indicate success.
        o The most numerous animals on our planet today, the insects, have open circulatory systems.

Reflect on Process
• Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
        o Answering this question correctly depended on your ability to use the idea of biological success in a new situation. If you got an incorrect answer, did you remember that success is not necessarily related to complexity or that animals with open circulatory systems are both abundant and diverse on our planet? Did you have trouble extending the idea of evolutionary success to determine the correct answer?