They all went extinct so that why their are no animals in the world
The US is unlikely to suffer from labor shortage because of the large immigration quotas that the country has and that are necessary. Thanks to the diversity in the country and the constant income of young people willing to work, there will be no labor force shortage.
It will be 25 beacues you add 2 down is 2 and add 2+3 is 5 so is 25 in total