How does the volcano effect the viability of natural resources in a food web

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?

The frequency of alleles in a population that is in hardy weinberg equilibrium? a . changes in each successive generation b. is less important than the frequency genotypes c. shows evidence of the process of natural selection d. remains the same over several generations