A student is conducting research on the impact of humans on whooping crane populations in the North America. Which statement best supports the students claim that animals have been positively impacted by human intervention?
Options:
In the early 1900s, the U.S. and Canada jointly signed a migratory bird treaty
Captive-bred whooping cranes have been introduced to natural environments
In the 1800s. North America was home to over 1,000 whooping cranes
Although the hunting of whooping cranes was criminalized, their numbers continued to decline