Movable spines uses for locomotion occur in

Options

A. Echinus
B. Ophiothrix
C. Holothuria
D. Antedon.

Answer

To solve the question "Movable spines used for locomotion occur in," we will analyze each of the given options step by step:

### Step 1: Understand the Options
The options provided are:
1. Kinase (likely referring to "Echinodermata" such as sea urchins)
2. Ophiothrix (brittle stars)
3. Holothuria (sea cucumbers)
4. Antedon (feather stars)

### Step 2: Analyze Kinase
- Kinase refers to sea urchins, which are echinoderms.
- Sea urchins have a spherical shape and are covered with movable spines.
- They use these spines along with tube feet to move by pushing against the substratum.
- Therefore, sea urchins (kinase) use movable spines for locomotion.

### Step 3: Analyze Ophiothrix
- Ophiothrix refers to brittle stars.
- Brittle stars have long, flexible arms and primarily use these arms for locomotion.
- They do not use movable spines for movement, so this option is incorrect.

### Step 4: Analyze Holothuria
- Holothuria refers to sea cucumbers.
- Sea cucumbers do not have limbs like arms; they move using tube feet.
- They do not utilize movable spines for locomotion, making this option incorrect.

### Step 5: Analyze Antedon
- Antedon refers to feather stars.
- Feather stars also use their arms for locomotion.
- They do not rely on movable spines for movement, so this option is incorrect.

### Conclusion
After analyzing all the options, the correct answer to the question is:
**Movable spines used for locomotion occur in Kinase (sea urchins).**

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