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.
Only 1- the experiment can not show a cause and effect relationship if there are more than one factors contributing to the outcome.
Answer by JKismyhusbandbae:
- decreases as altitude increases
- decreases with denser air
- equals mass divided by volume
Answer and Explanation:
It's a constrictive growth pyramid I think. They could die out in the future..
I can't remember the factors that have led to the growth
