In a sea shore, the benthic animals live in sandy, muddy and rocky substrate and accordinagly developed the following adaptations.
(a) Burrowing
(b) Building cubes
`(c)`Holdfasts/peduncle
Find the suitable substratum against each adaptation.

Explanation

To address the question regarding the adaptations of benthic animals in a seashore environment, we will identify the suitable substratum for each adaptation: burrowing, building cubes, and holdfasts/peduncle.

### Step-by-Step Solution:

1. **Burrowing**:
- **Adaptation**: Burrowing refers to the ability of certain animals to dig into the substrate.
- **Suitable Substratum**: This adaptation is typically found in **muddy** substrates where animals can easily dig into the soft sediment. An example of a burrowing animal is the tube worm, which creates a burrow in the mud.

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