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.
This relates to Evolution
Answer:certain ear shapes help the goats survive and reproduce I think. Not 100%
Explanation:
Thermal energy/ heat energy
I believe it's lactic acid and energy.
