What feature do the carbon and nitrogen cycles have in common?
A. often a limiting nutrient
B. involvement in global climate change
C. mostly local cycling
D. many microbes involved in cycling
E. a large atmospheric component
Answer: E
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The thermocline is broken down by temperature changes that allow upwelling to occur.
Answer the following statement true (T) or false (F)
Top-down factors that can control the population sizes of plants or animals include which of the following factors? Select all that apply.
A. levels of primary producers in the ocean B. nutrient-poor soil C. healthy populations of secondary carnivores D. the density of herbivores E. the presence of a fungal pathogen F. an extended period of drought
Chromosomes that do NOT determine the sex of an individual are called ________
A) homologous chromosomes B) nonhomologous chromosomes C) sex chromosomes D) autosomes
According to the logistic growth equation dN/dt = rmaxN(K — N)/K,
A) the number of individuals added per unit time is greatest when N is close to zero. B) the per capita growth rate (r) increases as N approaches K. C) population growth is zero when N equals K. D) the population grows exponentially when K is small. E) the birth rate (b) approaches zero as N approaches K.