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- Conservation status of specieschanges often as new threatsarise and current threatssubside. Fish and marine lifeare often threatened by humanactivities such as overfi shing,pollution of ocean and freshwater habitats, and climatechanges. When it comes tomaking choices about whatseafood to purchase andconsume, what resources areavailable to consumers to knowthat fi sh they are buying is notvulnerable or endangered?The type of place where a species typically lives is called its _______. a. niche c. community b. habitat d. populationFigure 19.6 If the major food source of seals declines due to pollution or overfishing, which of the following would likely occur? a. The carrying capacity of seals would decrease, as would the seal population. b. The carrying capacity of seals would decrease, but the seal population would remain the same. c. The number of seal deaths would increase, but the number of births would also increase, so the population size would remain the same. d. The carrying capacity of seals would remain the same, but the population of seals would decrease.
- Figure 45.10b If the major food source of the seals declines due to pollution or overfishing, which of the following would likely occur? The carrying capacity of seals would decrease, as would the seal population. The carrying capacity of seals would decrease, but the seal population would remain the same. The number of seal deaths would increase but the number of births would also increase, so the population size would remain the same. The carrying capacity of seals would remain the same, but the population of seals would decrease.An _______ has another species rear its young. a. mutualist c. brood parasite b. pioneer species d. exotic speciesSpecies A is present in a community. Species B is introduced to the community. Over the next year, the population sizes of both continual decrease from initial numbers. Which one of the following community interactions might be the cause of this decline? Interspecific competition O Intraspecific competition O Mutualism O Parasitism O Predation
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- Coral polyps and their symbiont zooxanthallae algae are an example of..... competition Ofacultative mutualism O obligate mutualism predation NGH 19Which of these organisms do you think is a keystone species. Explain why 31 you think so. Tertiary Consumers: Secondary Consumers: Gulls and Terns Primary Consumers: Herbivores: Primary Producers: Your answer Chesapeake Bay Waterbird Food Web Osprey Wading Birds Small Planktivorous Fish Zooplankton Phytoplankton Large Piscivorous Fish Benthic Invertebrates Sea Ducks Bivalves Bald Eagle Herbivorous Ducks Submerged Aquatic Vegetation (SAV) Tundra Swan Vegetation Geese and Mute SwansWhich nonnative species threatens the habitat in Olympic National Park? Wild boars O Mountain goats Gray wolves Hoary marmots O Mule deer