The ways in which a population is sampled to evaluate health or genetic diversity is influenced by its: distribution pattern birth rate death rate growth pattern

Option A, distribution Pattern

Explanation:

Distribution pattern or dispersal ability is a specific trait of population that determines the extent of possible movement and migration of a certain group from one habitat to other thereby standing at having a better chance of finding mates and maintaining genetic diversity. Therefore, in case if one fragmented population gets lost, there is scope of migrant population replacing it  

Hence, option A is correct

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d. planting trees

the trees take in carbon to make oxygen.