is called echinoderms
because, natural selection is the differential survival and reproduction of individuals due to differences in phenotype. it is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
2. population has some genetic variations.
genetic variation is essential for natural selection because natural selection can only increase or decrease frequency of alleles that already exist in the population. genetic variation is caused by:
mutation and random mating between organisms
3. nature select organism with specific traits to survive and reproduce.
according to charles darwin's theory of evolution by natural selection, organisms that possess heritable traits that enable them to better adapt to their environment compared with other members of their species will be more likely to survive, reproduce, and pass more of their genes on to the next generation.
plants respond to disease with their immune system.
so, the correct answer is a.
hope this ,