Biotic factors of an ecosystem refer to things that are living, plant or animal. The Grand Canyon National Park has lots of living organisms, both plant and animal. Cacti, bushes, scrub trees would make good choices for the plant side. Fish in the river, coyotes, mountain lions, prarie dogs, and human beings would make good choices for the animal side of the biotic question. Bacteria, viruses, and other microorganims would fall in line on the biotic side of the question as well.
Abiotic would be the exact opposite of biotic. If biotic refers to all the things in an ecosystem that are living, abiotic would refer to all the nonliving parts of that ecosystem. Things like the water in the river, the rocks, the boulders, the soil, the weather, and the climate would be excellent examples to choose from on the abiotic side of the question.
The Grand Canyon National Park contains the Grand Canyon, a naturally-produced gorge of the Colorado River. It covers 1902 square miles, coesisting in Cococino county and Mohave county.