Define productivity . Mention the two types of productivity.

Explanation

**Step-by-Step Solution:**

1. **Define Productivity:**
- Productivity refers to the rate of biomass production in an ecosystem. It measures how much organic matter is generated over a specific area and time period.

2. **Identify the Two Types of Productivity:**
- The two main types of productivity are:
- **Primary Productivity:** This is the rate at which producers (mainly plants) create biomass through photosynthesis. It quantifies the amount of organic matter produced per unit area over a given time period by these producers.
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