Is all the primary productivity available to a herbi- vore ? If not, why.

Explanation

To answer the question "Is all the primary productivity available to a herbivore? If not, why?", we can break it down into several steps:

### Step-by-Step Solution:

1. **Understanding Primary Productivity**:
- Primary productivity refers to the amount of organic matter (biomass) produced by plants through photosynthesis. This is the energy available in an ecosystem.

2. **Role of Herbivores**:
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