Ecosystem forest , Grassland , Estuaries , Pond Lake Wetland.
From the above given options how many can be categorised into terrestrial and aquatic ecosystem respectively ?

Explanation

To categorize the ecosystems into terrestrial and aquatic, we can follow these steps:

### Step 1: Understand the Definitions
- **Terrestrial Ecosystem**: These are ecosystems found on land. They include forests, grasslands, deserts, and tundras.
- **Aquatic Ecosystem**: These ecosystems are found in water bodies. They include freshwater ecosystems like ponds and lakes, as well as marine ecosystems like oceans and estuaries.

### Step 2: Identify the Given Ecosystems
The ecosystems provided in the question are:
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