Passenger Pigeon Extinction?

Question

What animals might have benefit if the passenger pigeon had not become extinct?

and what two ecosystems have high biodiversity n wut two have low?

Answer 1

Did any plants rely  on the passenger pigeon for transport of its seeds in the dropping of the bird?

Some berry plants disperse seeds in this way.

Or did any natural predators hunt the passenger pigeon before the arrival of humans.

These are two systems the extinction of the bird could have altered.

Read your research - see if there is a matching plant or predator

Answer 2

Humans benefited from the passenger pigeon. It was market hunting, without restriction that wiped out a bird that was so abundant that flocks covered miles of sky and their weight was enough to break tree limbs when they settled. Tha last one (Martha) died in 1906, as I recall,

Biodiversity varies inversely with stress. The less stress, the greater diversity and vice versa. Tropical rain forests, tide pools, and lagoons have high diversity. Highly polluted areas, polar regions, and farm fields (monoculture) have low diversity.