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Which of the following did NOT occur during the Cambrian Explosion?. Animals acquired specialized cells, tissues, and organs. There was an extraordinary growth in animal diversity. Animals evolved simpler body plans. Animal appendages became specialized for a variety of functions.
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Biologists trace the evolution of invertebrate groups by studying their appearance in the fossil record. For which invertebrate would this type of study be most difficult?
Animal A has a respiratory surface area of 50 mm2, and animal B has a respiratory surface area of 25 mm2. If other features of their respiratory surfaces are the same, the rate of gas exchange will be greater in animal A. _________________________
The excretory system of animal X functions to conserve body water while removing nitrogenous wastes. Animal X most likely lives on land. _________________________
The eruption of a volcano creates a new island in the ocean. Animals that settle on the island can increase in number most rapidly if they reproduce asexually. _________________________
If an animal moves by contracting muscles that surround a body cavity filled with fluid, the animal has a(an) ____________________ skeleton.
In some invertebrates, eggs are fertilized outside the female’s body. This type of fertilization is known as _________________________ fertilization.
The animals that existed before the Cambrian Period were probably very simple. Describe two ways in which these animals may have obtained nutrients.
In some animals, blood can be distinguished from extracellular fluid, which is the liquid solution that surrounds the cells of an animal’s body. Explain why such a distinction is possible for animals with a closed circulatory system but not for animals with an open circulatory system.
When individuals in a population are few and widely scattered, hermaphrodites might have a better chance of reproducing sexually than animals that have separate sexes. Explain why.