researchers hypothesized that a decline in the population of dusky sharks near the mid-atlantic coast of north america led to a decline in the population of eastern oysters in the region. dusky sharks do not typically consume eastern oysters but do consume cownose rays, which are the main predators of the oysters.
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which finding, if true, would most directly support the researchers hypothesis?
a declines in the regional abundance of dusky sharks prey other than cownose rays are associated with regional declines in dusky shark abundance.

b eastern oyster abundance tends to be greater in areas with both dusky sharks and cownose rays than in areas with only dusky sharks.

c consumption of eastern oysters by cownose rays in the region substantially increased before the regional decline in dusky shark abundance began.

d cownose rays have increased in regional abundance as dusky sharks have decreased in regional abundance.

Question

researchers hypothesized that a decline in the population of dusky sharks near the mid-atlantic coast of north america led to a decline in the population of eastern oysters in the region. dusky sharks do not typically consume eastern oysters but do consume cownose rays, which are the main predators of the oysters.
12 □ mark for review
which finding, if true, would most directly support the researchers hypothesis?
a declines in the regional abundance of dusky sharks prey other than cownose rays are associated with regional declines in dusky shark abundance.

b eastern oyster abundance tends to be greater in areas with both dusky sharks and cownose rays than in areas with only dusky sharks.

c consumption of eastern oysters by cownose rays in the region substantially increased before the regional decline in dusky shark abundance began.

d cownose rays have increased in regional abundance as dusky sharks have decreased in regional abundance.

Accepted Answer

# Brief Explanations:
The researchers' hypothesis likely involves a trophic cascade: dusky sharks (predators of cownose rays) decline, so cownose rays (predators of eastern oysters) increase, leading to oyster decline. To support this, we need a finding that shows the expected population changes.

- Option A: Talks about other prey of sharks, not relevant to oyster decline.
- Option B: Compares oyster abundance in areas with different predators, but doesn't show the causal chain.
- Option C: Says oyster consumption by rays increased before shark decline, which would contradict the hypothesis (shark decline should precede ray increase and then oyster decline).
- Option D: Shows cownose rays increased as dusky sharks decreased. This fits the trophic cascade: shark decline → ray increase → oyster decline (since rays eat oysters). So this directly supports the hypothesis by showing the expected change in the intermediate species (rays) as the top predator (sharks) declines.

# Answer:
D. Cownose rays have increased in regional abundance as dusky sharks have decreased in regional abundance.

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