Answer the following question given this paragraph: Population size is the number of individuals in a population. Population density is the average number of individuals per unit of area or volume. The pattern of spacing of individuals in a population may be affected by characteristics of a species or its environment. Q: What is the average number of individuals per unit of area or volume called? Choices: - crowdedness - population structure - population count - population density A:
population density
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Answer the following question given this paragraph: Gray Horns In cross-section, the gray matter of the spinal cord has the appearance of an ink-blot test, with the spread of the gray matter on one side replicated on the othera shape reminiscent of a bulbous capital "H. " As shown in Figure 13.14, the gray matter is subdivided into regions that are referred to as horns. The posterior horn is responsible for sensory processing. The anterior horn sends out motor signals to the skeletal muscles. The lateral horn, which is only found in the thoracic, upper lumbar, and sacral regions, is the central component of the sympathetic division of the autonomic nervous system. Some of the largest neurons of the spinal cord are the multipolar motor neurons in the anterior horn. The fibers that cause contraction of skeletal muscles are the axons of these neurons. The motor neuron that causes contraction of the big toe, for example, is located in the sacral spinal cord. The axon that has to reach all the way to the belly of that muscle may be a meter in length. The neuronal cell body that maintains that long fiber must be quite large, possibly several hundred micrometers in diameter, making it one of the largest cells in the body. Q: What type of matter in the spinal cord has the appearance of an ink-blot test and is subdivided into regions that are referred to as horns? Choices: - bright matter - wet matter - dark matter - gray matter A:
gray matter
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Answer the following question given this paragraph: Q: What is asexual reproduction in which an egg develops without being fertilized called? Choices: - metamorphosis - budding - binary fission - parthenogenesis A:
parthenogenesis
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Answer the following question given this paragraph: Cooling and crystallization. Deep within the Earth, temperatures can get hot enough to create magma. As magma cools, crystals grow, forming an igneous rock. The crystals grow larger if the magma cools slowly, as it does if it remains deep within the Earth. If the magma cools quickly, the crystals will be very small. When crystals form from magma it is called crystallization . Q: What is it called when crystals form from magma? Choices: - sedimentation - transpiration - vulcanism - crystallization A:
crystallization
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