The Tamana Cave system in Trinidad is relatively unaffected by the environment outside of the cave walls, like most cave ecosystems. Since a very limited amount of light can enter the cave, bat movement controls the temperature cycle rather than the solar radiation that controls it in the surrounding forest. Similarly, the ecosystem cannot be sustained by energy from photosynthesis and so the main source of energy comes from the guano produced by the insectivorous bat species, N. tumidirostris. The frugivorous bat species, P. hastatus, also roosts inside of the cave, but the wetness of the top level of its guano prevents the guano from being suitable for cockroach consumption and therefore ends the flow of energy through the system. STELLA software was used to create a model consisting of three stacked logistic growth equations that demonstrate the ecosystem of Tamana cave. The model focuses on the population of insectivorous bats, on the guano that this species produces, and on the cockroach species, E. distanti. The model provides insight into the population dynamics and environmental processes at play in the cave, and is useful in predicting the behavior of the ecosystem. After running the model under a number of different scenarios, the graphs were used to visually display the effects of altering inputs in the system. These altered inputs represent hypothetical changes that could occur in a natural system such as a lowered intrinsic rate of increase bat population, an increase in initial bat population, or a decrease in the amount of guano that each cockroach needs to survive.

As women in South Africa, it is important for us to understand the nature of our oppression, for it is only after understanding it, can we identify the target of our attack and plan the appropriate strategy and tactics for our struggle. Black women in South Africa suffer three types of oppression. 1. Political oppression, which is common to all blacks in South Africa, ie. the denial of rights to vote for or choose the type of government we want, and the denial of rights as a people in South Africa. 2. Economic oppression as black workers in South Africa. Black women workers are even more exploited than men workers. They are paid lower wages for the same job, are treated as temporary staff and can be fired at anytime especially if they fall pregnant. 3. Social oppression which stems from the idea that women are born inferior to men and therefore have to play an inferior role in society. The socialization process starts at birth and women and men are geared towards certain roles in society. Men most often towards leadership positions and professional jobs and women towards household duties and secretarial jobs. This socialization process continues throughout ones life such that most people accept it as a natural phenomenon and a way of life. Having understood the forms of oppression, we can see that the struggle is not between men and women, where men are seen as the source of our oppression. Nor is it a struggle for mechanical equality between men and women ie. being paid the same wages as men, and having equal status as men in society, because this will mean equality within the present status quo. Our struggle is a struggle between womenand the existing social order. It is a struggle of the oppressed against oppression. Our main weapons in the struggle for liberation are UNITY and ORGANISATION. Unity is realised through common effort, links are forged through collective work and study, through criticism and self-critcism and through action against opression. Organization can be achieved through women's groups and organization. A women's group's first demand should be the clarification of our ideas, to get rid of miscosepts and erroneous ideas concerning the role and liberation of women. A women's group usually tackles the question of social oppresion, but more important, it must be seen as a stepping stone towards involvement in the broader struggle can we destroy the foundations of exploitative society and rebuild society on new foundations. Foundations built on the demands of the FREEDOM CHARTER. “The fundamental struggle is for national liberation of the oppressed people of South Africa, and any women's organization that stands outside this struggle must stand apart from the mass of women. What was realised by the Federation of South African Women was that it would be impossible for women to achieve their rights as women in a society in which so many fundamental rights are denied to both men and women by virtue of their colour and their class. Therefore just as there can be no revolution without the liberation of women, the struggle for women's emancipation cannot succeed without the victory of the revolution".