A producer a living organism that makes its own food using light energy is called autotroph

Glucose, also called grape sugar, blood sugar or corn sugar, is among the simplest and one of the primary naturally occurring sugars. produced naturally by plants as the primary photosynthesis product, it is heavily used by living beings as a main energy source and is necessary for cellular respiration. chemically, it is a monosaccharide carbohydrate and serves as a building block for complex sugars like starch.

This movement is also referred to as  glacial plucking

It's either -limiting factors or -scarce resources but i'd go with my first answer since the food and water are abundant they really aren't scarce