Succession and Extinction

Question 1

✔ primary successionX secondary succession

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✔ primary succession; In coastal areas, wind moves sand, blowing away or engulfing the soil, and eventually creating sand dunes:: primary succession; The introduction of livestock to an area leads to over-grazing that removes native grasses:: secondary succession; A forest is cleared to gather lumber used for building houses:: secondary succession; A lava flow down the side of a volcano destroys all vegetation and eventually turns into volcanic rock when it cools and hardens:: primary succession

Question 2

X primary succession✔ secondary succession

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✔ secondary succession

Question 3

X primary succession✔ secondary succession

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✔ secondary succession

Question 4

✔ primary successionsecondary succession

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✔ primary succession

Question 5

When a population becomes small, diversity is lost: X species diversitygenetic diversity

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genetic diversity

Question 6

What type of succession does this passage describe?

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phytoplankton

Question 7

Every organism in an ecosystem relies on other species for survival: species diversityX genetic diversity

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species diversity; genetic diversity

Question 8

extinct speciesendangered speciesX threatened species

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extinct species; The Tasmanian tiger, the largest known carnivorous marsupial, was wiped out of the wild due to constant hunting:: extinct species; The Amur leopard is now gone from most of its original habitat due to human activity. Only twenty to thirty Amur leopards remain in the wild:: endangered species; Western Lowland gorilla populations have dropped sixty percent in the past twenty-five years due to poaching, habitat loss, and, mainly, disease. Their numbers are expected to keep dropping, and the s: endangered species; The Eastern gemfish population has declined due to commercial fishing. New protection efforts seem to be helping the population slowly recover:: threatened species; The golden toad was forced from its breeding sites when erratic weather caused pools to dry up. No frogs have been found in over two decades:: extinct species

Question 9

Reduced options for mates can lead to inbreeding: species diversity✔ genetic diversity

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genetic diversity

Question 10

extinct speciesendangered speciesX threatened species

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endangered species

Succession and Extinction Answers

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