Sculptural materials that are soft, pliable, and are easily manipulated possess what specific property

ephemeral property

Explanation:

It is the ephemeral property of a sculptural material that allows it to be easily manipulated in different forms, shape, texture and sizes.

These materials are basically used for constructing natural objects and human artifacts for a temporary  period only as these objects are made with the purpose of providing aesthetic value.

Some common example of ephermal art materials are

a) land art

b) sand sculptures

c) ice sculptures

d) chalk drawings

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.