Question

select the best answer for the question.

1. a population of sea life was very successful in its marine environment. suddenly, this sea life experienced a rapid decrease in population and ultimately, extinction. which of the following processes most likely led to this extinction?

a. marine regression
b. marine transgression
c. marine unconformity
d. tsunami
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Explanation:

• Option A: Marine regression is the process where sea levels fall, reducing the marine environment (like shallow seas shrinking). If a sea - life population was adapted to a marine environment, a rapid marine regression would drastically change their habitat (e.g., loss of shallow - water habitats they depended on), leading to population decline and possible extinction.
• Option B: Marine transgression is the rise of sea levels, which would expand the marine environment, not reduce it. So this would be more likely to benefit marine life or at least not cause extinction due to habitat loss from sea - level change in this way.
• Option C: Marine unconformity is a geological feature related to the non - deposition or erosion of sedimentary layers, not a process that directly affects the marine environment's suitability for sea life in terms of habitat availability on a scale that would cause rapid extinction of a successful population.
• Option D: A tsunami is a short - lived, sudden event (a large ocean wave). While it can cause local destruction, it is not a process that would lead to the extinction of a whole population that was successful in its environment over time. Extinction due to a tsunami would be very local and not likely to cause the extinction of a species that was widespread and successful in its marine environment.

Answer:

A. Marine regression