What is the correct order of largest to smallest respiratory structures?
a. Bronchiole - alveolar duct - alveoli
b. Alveoli - alveolar duct - bronchiole
c. Alveoli - bronchiole - alveolar duct
d. Alveolar duct - alveoli - bronchiole
e. Bronchiole - alveoli - alveolar duct
a
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Ecotourism measures ecosystem services such as carbon dioxide processing or water retention and purification
a. True b. False
Cytoplasmic localization in animal eggs gives rise to ________
a. the yolk b. mRNA transcripts c. the polarity of the embryo d. two identical embryos
Many substances have been shown to accumulate in ecosystems, including the pesticide dichlorodiphenyltrichloroethane (DDT), which was described in the 1960s bestseller, Silent Spring, by Rachel Carson. DDT was a commonly used pesticide before its dangers became known. In some aquatic ecosystems, organisms from each trophic level consumed many organisms of the lower level, which caused DDT to increase in birds (apex consumers) that ate fish. Thus, the birds accumulated sufficient amounts of DDT to cause fragility in their eggshells. This effect increased egg breakage during nesting and was shown to have adverse effects on these bird populations. The use of DDT was banned in the United States in the 1970s. This is an example of which of the following?
a. biomass b. concentrated bioproductivity c. biomagnification d. bioentropy
Which of the following are accessory pigments in
plant photosynthesis? a. carotenoids b. xanthophylls c. anthocyanins d. chlorophyll b e. all of these