Which of the following characteristics describes primary suc…
Which of the following characteristics describes primary succession I. Occurs near a volcano after an eruption II. Occurs after a fire or tornado III. Involves soil with no plants growing in it IV. Occurs after a retreat of a glacier
Read DetailsIn the North Pacific, sea otter populations collapsed in the…
In the North Pacific, sea otter populations collapsed in the 1990s. Scientists observed that killer whales (orcas), which rarely preyed on otters historically, began targeting them as populations of their traditional prey (seals and sea lions) declined. A researcher states:”Otter numbers don’t dictate orca abundance; rather, orcas switch to otters when their primary prey is scarce. Without the seal decline, orcas wouldn’t impact otters.” Ignoring human influences, the orca population is most likely regulated in a:
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