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.
Hydrogen Cyanide is an example of a blood agent.
Answer:
A) They release the excess energy as heat.
Explanation:
when plants absorb more energy than they use it can damage critical protein. to prevent this plants turn the excess energy into heat and send it back out.
Answer:
An electromagnetic wave is a wave that can travel through empty space and through matter.
Explanation:
Already answered in pm ;P
