Help solve a, b and c

Dynamic Energy Budget (DEB). Plants and animals come in a wondrous variety of shapes, sizes, and forms. In any of their forms, plants and animals can be thought of as consumers. That is, plants must consume water, nutrients, and sunlight to survive. Animals must consume a variety of different resources to survive (including plants!). The energy in the resources they consume is utilized in growth, reproduction, and basal maintenance. The following is a simple schematic that represents the basic components of a DEB (we have ignored several energy requirements to keep the model simple). Organism Reproduction Food In Storage Growth a Suppose energy enters storage (S) via a constant food source at rate PA. Energy leaves storage at a rate that is proportional to the amount of energy in storage with rate parameter PL. Once the energy leaves storage it is partitioned into growth (G) and reproduction (R), with proportion