<span>Classification systems are only as good as the criteria used to create them. Over time, those criteria that are considered "obsolete" will be trashed and new criteria developed. In this way, systems stay both relevant but able to reach across generations.</span>
Virus are smaller than bacterials.Virus are particles and can not survive with out a host
Regretfully, you have not included in the question, the choices that would be our guide to arriving in the answer to this query. However, as a general knowledge, the acidity of a substance can be measured by its pH which is equal to,
pH = -log[H+]
which means that the increase in H+ ions will lead to the decrease in pH. A smaller pH value denotes that the substance is more acidic.
Answer:
Mutation
Explanation:
The main cause of variation within a population is usually through genetic mutation.
Mutation is the alteration of the genetic sequence within an organism. It often lead to formation of new genetic patterns and codes.
Most times, environmental influences are paramount to causing genetic mutation within a population.
Other times, it might be due to competition and some other internal factors.
Mutation can be transferred from parents to offspring in most cases.
