After 4 weeks many of the tadpoles had died. Suggest two reasons why the tadpoles died.

The decrease in the tadpole population can be attributed to several limiting factors within the pond ecosystem: - **Predation:** Tadpoles are a food source for many other animals, including fish, newts, birds (like herons), and the larvae of insects like dragonflies. As the tadpoles grow, they become more visible to predators. - **Competition:** As the tadpoles grow, they require more food (algae, plant matter) and oxygen. If these resources are limited, there will be competition among the tadpoles, and the weaker individuals may not survive. - **Disease:** Like any population, the tadpoles are susceptible to diseases, which can spread through the water and cause significant mortality. - **Abiotic Factors:** A change in the pond's conditions, such as a drop in oxygen levels (due to hot weather or decomposition), an increase in pollutants, or a change in pH, could also lead to the death of many tadpoles.