homogeneity

noun [抽象名词]同质；同种；同次性（等于 homogeneousness）

Almost like clones in their similarity to one another, the cheetah species' homogeneity makes them especially vulnerable to disease.
就像克隆人之间的相似性一样，猎豹这一物种的同质性使它们特别容易受到疾病的伤害。