Answer:
Hey!
Your answer is Species Diversity!
Explanation:
The meaning of Species diversity is the population of species and abundance of each species which have a habitat in a particular location. (the location here is EARTH)
Hope this helps!
*if its wrong you can let me know!*
The appropriate choice for the non-event is ...
... A. The costs of sewing machines began to increase.
_____
Interchangeable parts generally reduce costs and increase demand (and production).