Which of the following statements is not true about ecosystems?
a healthy ecosystem can support an unlimited number of life forms.
the parts of an ecosystem depend on each other.
predators play a role in balancing the earth's ecosystems.
people's activities can improve the health of an ecosystem.

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.

where are the statements without that i cant you