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the answer is 4. Variations that help with survival will be passed on to future generations and will rapidly change the whole population.
Variations that help individuals within a population to adapt are passed on to future generations and only gradually change the whole population, not rapidly.
Natural selection
The natural selection theory was proposed by Charles Darwin to explain how populations evolve with time.
According to Darwin, individuals within the same population compete for limited resources with those with stronger genes individuals being able to outcompete the weak ones.
Thus, individuals with stronger genes are able to reproduce more with their offspring inheriting the stronger genes while individuals with weak genes contribute less to the future generation.
Gradually, could take millions of years, weak genes within the population are phased out while only strong genes remain. The population is said to have evolved.
More on natural selection can be found here: https://brainly.com/question/2725702