The flu vaccine changes every year. The flu vaccine is based on a predicted strain that is anticipated to be the most infectious that year. Thats why people who sometimes get the vaccination still get the flu, they don't have the antibodies for the strain they were infected with. Strains for viral disease don't change very much and usually the vaccination for them cover them well.
Answer:
Made mostly of collagen, bone is living, growing tissue. Collagen is a protein that provides a soft framework, and calcium phosphate is a mineral that adds strength and hardens the framework. This combination of collagen and calcium makes bone strong and flexible enough to withstand stress.
"Social Darwinism<span> is a modern name given to various theories of society that emerged in the United Kingdom, the United States, and Western Europe in the 1870's, and which are claimed to have applied biological concepts of natural selection and survival of the fittest to sociology and politics", so, in therory, it would allow AND promote imperialisim, as many people are not within the same level of society.</span>
Twenty two thousand so the answer is c
