What is the major threat to the survival of organism?

Explanation

**Step-by-Step Solution:**

1. **Identify the Major Threats**: The major threats to the survival of organisms include unsustainable agriculture, deforestation, climate change, and abrupt population growth.

2. **Unsustainable Agriculture**: This refers to farming practices that do not maintain the quality and quantity of food. Poor agricultural practices lead to low-quality food, which affects the nutrition and survival of organisms.

3. **Deforestation**: The cutting down of forests leads to habitat loss for many species. It also reduces the number of plants that can absorb carbon dioxide, contributing to climate change.

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