Which of the Following Is a Likely Explanation as to Why

question 21

Multiple Choice

Which of the following is a likely explanation as to why terrestrial animals do not have a skeleton built entirely of cartilage?

• A)Cartilage grows quickly and must be replaced frequently, leaving organisms with a cartilaginous skeleton vulnerable to predators for most of their lives.
• B)Cartilage is too porous to be used as a skeletal material on land. The numerous holes in this tissue would lead to rapid water loss from the body.
• C)Terrestrial organisms require a living skeleton that can respond to environmental change. Cartilage does not contain cells and, therefore, cannot respond.
• D)Cartilage is not as strong as bone and probably cannot support the weight of the body against the pull of gravity.

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