Answer:
The correct answer is None of these choices are correct.
Explanation:
Crossing over doesn't occur only between heterozygous genes, it also doesn't happen only in some chromosomes and it never reduces de variation, otherwise, the crossing over is one of the main causes of variation among species.
Anticline I believe would be the answer but in not the smartest so yeah
The answer is D- Inspect ships moving through international waters to prevent the introduction of invasive species, which can potentially outcompete native species
