Final answer:
Correct options are A) and E). Darwin's concept of 'descent with modification' was influenced by Malthus, who believed human competition for limited resources leads to a struggle for existence. This principle was integral to Darwin's theory of natural selection and evolution.
Step-by-step explanation:
Charles Darwin's idea of 'descent with modification,' a core concept of evolution, was influenced by the work of Thomas Malthus. Malthus' writings suggested that human populations would endure a struggle for existence due to exponential growth outpacing the slower increase in food resources, leading to competition for these limited resources. Therefore, the two correct answers to the student's question are:
- Humans would have to compete for limited resources, and only some would survive.
- The human population would eventually reach its size limit due to limited resources on Earth.
These ideas contributed to Darwin's theory of natural selection, where individuals with favorable characteristics for their environment are more likely to survive and reproduce, leading to adaptations in populations over generations.