Answer:
Natural selection is a process where the environment changes and populations have genetic variation, leading nature to select organisms with advantageous traits for survival and reproduction.
Step-by-step explanation:
Complete sentences:
The environment needs to change in order for natural selection to occur because different traits may become advantageous or disadvantageous in different environmental conditions, leading to differential survival and reproduction.
Populations have some genetic variation, meaning that individuals within a population differ in their traits, including physical, behavioral, and physiological characteristics.
Nature selects organisms with specific traits to survive and reproduce based on their ability to adapt to the environmental conditions and compete for resources, leading to the accumulation of advantageous traits over generations.