does it also depend on resources for survival?
Yes, as per scientific research, if they adapt to their environments they are more likely to survive and reproduce. If there is some variation between them and that variation is heritable, then a progressive evolution will take place.
Natural selection
In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved". The concept was simple but powerful: individuals best adapted to their environments are more likely to survive and reproduce. As long as there is some variation between them and that variation is heritable, there will be an inevitable selection of individuals with the most advantageous variations. If the variations are heritable, then differential reproductive success leads to a progressive evolution of particular populations of a species, and populations that evolve to be sufficiently different eventually become different species.
when does the genetic material of a host and a virus combine Only when the host is infected by the virus. can you please define the latter term? It is a submicroscopic infectious agent that replicates only inside the living cells of an organism. how did it get its name? From the Latin word ”Virulent” that refers to poison. what features of life do they exhibit? They resemble organisms in a way that they possess genes, evolve by natural selection, and reproduce by creating multiple copies of themselves through self-assembly. However, they do not have a cellular structure, which is often seen as the basic unit of life. can you describe this process of evolving that you just mentioned? It 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. does it causes changes in gene? Yes, it can. However, it depends on the its effect on genetic diversity. “Purifying" selection acts to remove genetic variation and "de novo” mutation can lead to a new variation.
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Natural selection [SEP] Darwin's theory
In 1859, Charles Darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. He defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved". The concept was simple but powerful: individuals best adapted to their environments are more likely to survive and reproduce. As long as there is some variation between them and that variation is heritable, there will be an inevitable selection of individuals with the most advantageous variations. If the variations are heritable, then differential reproductive success leads to a progressive evolution of particular populations of a species, and populations that evolve to be sufficiently different eventually become different species.