Instincts are innate, natural behaviors that animals are born with, and they play a crucial role in their survival and adaptation to their environment. These instincts are genetically programmed and are not learned through experience or observation. Here are some key points about instincts in animals:

1. Survival Instincts

2. Migration

3. Territorial Behavior

4. Maternal Instincts

5. Social Hierarchies

6. Courtship and Mating

7. Hibernation and Dormancy

8. Communication

Overall, instincts are essential for animals to navigate their environment, find resources, interact with others of their kind, and ensure the continuation of their species.

Hence, answer for the question is option D instincts.

Understanding Animal Characteristics
In the question regarding what all animals possess, the correct answer is option 'D': Instincts. Here’s why instincts are fundamental to all animals:
What are Instincts?
- Instincts are innate behaviors that organisms are born with, which enable them to respond to environmental stimuli without the need for learning.
Universal Presence in Animals
- All animals, from the simplest organisms to the most complex mammals, have instincts that guide their survival. For instance:
- Finding Food: Animals instinctively know how to hunt or forage for food, which is crucial for survival.
- Reproduction: Many species exhibit instinctual behaviors related to mating and raising offspring.
- Self-Protection: Instincts help animals recognize threats and engage in fight or flight responses.
Comparison with Other Options
- a) Eyes: While most animals have eyes, some species, like certain worms and bacteria, do not possess them.
- b) Four Legs: Not all animals have four legs; many species, including birds, fish, and insects, have different limb structures.
- c) Horns: Horns are characteristics found in specific animal groups, such as certain mammals, and are not universal.
Conclusion
- Instincts are a fundamental part of animal behavior and survival, making them a universal characteristic among all animals. This highlights the importance of instincts in the animal kingdom, distinguishing them from other physical traits that are not consistently present across species.