I would go with A, they inherited the wings even though they don't need them today, since evolution has changed the Ostrich in some way.
Go to Africa you can. Traffic tropical trees there they like this talk has the Statue of Liberty or the statue or higher did a statue
Population decreases by 15.
Birth rate means more population (positive), death rate means less population (negative), immigration means more (positive), and emigration means less (negative). So, just add and subtract the appropriate numbers:

Negative 15 people means that the population decreases by 15.
Yep, however if you’re male you will see more of a difference but female to tend to grow