The answer is B, bird flu. The other diseases have been around much longer than bird flu has. Bird flu has been in Asia since 2003, but didn't reach Europe and the middle east until 2005, making bird flu a very new disease.
Answer:
the cell wall which is the cell membrane
Explanation:
the cell membrane gives the cell its shape and it protects the bacterial cell from the environment.
A the increase in genetic variation of a population
Answer:
It is important to have more than one piece of evidence to make sure that the evidence is actually evidence. Or in other words, that the evidence is proven true. With only one piece of evidence, you can't be fully sure if calculations were correct, if the source was trustworthy, etc.
Multiple evidence is kinda like double checking math problems. If you don't do it, you can't be 100% certain the answer is correct.
Density.
If the density is more than that of water than it sinks.
If it is less than it floats.
Density is the amount of mass in a certain space, therefore
D = M/V
Density = mass divided by volume
