What human activities prevent the artificial ecosystem of the city park from changing?

Explanation:

People running, cycling, and existing scares away animals

well schools are being forced to embrace computers. unlike their "digital immigrant" teachers, these students are "digital natives", born into a world where technology is an integral part of everyday life. almost every student has access to a multitude of computers, laptops and tablet devices. it would be crazy to assume an assignment would  not be written on computer in this day and age.

don't delete this trying to

/the trachea, commonly known as the windpipe