Question

what will happen if all the plants are creepers

Answer 1

Both creepers and climbers are weak-stemmed plants and, hence, cannot grow erect without support. The difference is that creepers spread horizontally along the soil. At the nodal regions - where leaves grow - they produce fibre-like roots arising from the base of the stem, which get fixed and grow further.

Answer 2

if all plants are creepers there will be no shelter for many birds and animals