What are three basic population growth curves? When might you see them in nature?
What will be an ideal response?
The three types of population growth curves are the constant population growth rate, the J-curve (exponential growth) and the S-curve (logistic growth). The constant population growth rate remains constant over time and results in a straight line when plotted on a growth curve (population number vs. time). It is highly unlikely that this type of growth would be found in nature. The J-curve demonstrates population growth under optimal conditions, with no restraints. The S-curve shows a population at equilibrium. The J-curve is caused by exponential growth of a population and the absence of mechanisms to cause the population to level off; exponential growth can occur in nature. Humans, for example, have been growing exponentially for many generations now. J-curve growth is not sustainable and the consequence of this type of growth is a population crash and a reduction in the carrying capacity. The S-curve is caused by exponential growth of a population until natural mechanisms cause the population to level off at the carrying capacity (K) and continue in a dynamic equilibrium. The causes of this type of growth are the various biotic and abiotic factors that limit a population's size.
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If you could line up atoms of lead-208, approximately how many atoms would you need to line up in order for them to form a line 1 inch long?
A) 82 B) 208 C) 8.2 x 107 D) 1.6 x 1012
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A. the lower spin velocity and lower atmospheric solar heating at the equator. B. the higher spin velocity and higher atmospheric solar heating at the equator. C. the lower spin velocity and higher atmospheric solar heating at the equator. D. the higher spin velocity and lower atmospheric solar heating at the equator. E. None of these choices are correct.
Which of the following best matches the description?Horizontal layer of soil.
A. loam B. soil structure C. soil texture D. asthenosphere E. terrace F. windbreak G. horizon H. weathering I. chemical weathering J. lithosphere K. mechanical weathering L. friable M. contour farming N. leaching O. humus P. parent material Q. soil profile