variation within populations of plant pathogens

例句：

1. 1. The population ofthe species has undergone significant variations inrecent years.
   该物种的种群在过去几年经历了显著的变化。
2. 2. Variations intemperature can affect the growth rate of plants.
   温度的变化会影响植物的生长速度。
3. 3. The geneticmakeup of a species is a reflection ofits evolutionary history and environmental adaptations.
   一个物种的遗传构成是其进化历史和环境适应的反映。