Seed Dispersal by Animals
Seed dispersal is the process by which seeds are transported and spread away from the parent plant. There are various methods of seed dispersal, and one of them is through animals. Animals can aid in dispersing seeds by carrying them to new locations, either by ingesting them or by sticking to their fur or feathers. Among the given options, the seed that is dispersed by animals is the Cocklebur.

Cocklebur
Cocklebur is a plant that produces small, spiky seeds that are dispersed by animals. The seeds have tiny hooks or spines that allow them to stick to the fur or feathers of animals. When animals brush against the plant, the seeds easily attach to their bodies. The animals then carry the seeds to different places as they move around. The seeds can be transported over long distances before eventually falling off the animals or getting brushed off.

Other Options
a) Pea: Pea seeds are not dispersed by animals. They are typically dispersed through self-fertilization or by human intervention, such as planting or harvesting.
b) Coconut: Coconut seeds are not dispersed by animals either. They are primarily dispersed by water currents, as coconuts can float in water and be carried to new locations.
d) Balsam: Balsam seeds are not dispersed by animals either. They are dispersed through explosive mechanisms, where the seed pods burst open and scatter the seeds in the surrounding area.

Importance of Seed Dispersal
Seed dispersal is crucial for the survival and distribution of plant species. By being dispersed to new locations, seeds can escape competition with the parent plant and have a greater chance of finding suitable conditions for growth. Animal dispersal is especially advantageous as it allows seeds to be transported over longer distances compared to other dispersal methods.

Conclusion
In conclusion, among the given options, the seed that is dispersed by animals is the Cocklebur. The spiky seeds of the Cocklebur easily attach to the fur or feathers of animals, enabling the seeds to be transported to new locations. Seed dispersal by animals is an important mechanism that aids in the survival and distribution of plant species.