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The session reviewed eutrophication, marine ecosystems, introduced species, interbreeding vs. inbreeding, and ecosystem models. The Student practiced answering questions related to land clearance, soil restoration, agricultural practices, algal blooms, commercial fishing, soil as a resource, irrigation, human activities' impact on waterways, and characteristics of potential pest species. A follow-up session was scheduled to review the material before the Student's exam.

The session covered human impact on ecosystems, including topics like monoculture, salinity, land and soil degradation, habitat destruction, urbanization, and pressure on resources. The Student and Tutor discussed specific examples and mechanisms related to each topic. The next session is planned to cover eutrophication, marine ecosystems, introduced species, and related questions, with a tentative schedule for the following day.

The Student and Tutor reviewed primary and secondary ecological succession, the roles of K-selected and R-selected species, and the impact of disturbances and human activities on ecosystems. They discussed examples such as grasslands, tsunamis, and fire regimes and examined the effects of European settlement on Australian ecosystems. The next session will continue with Chapter 6, followed by a comprehensive review of Units 1 and 2.

The Tutor introduced Molecular Orbital Theory to the Student, covering atomic vs. molecular orbitals, bonding and anti-bonding interactions, and bond order calculations. The Student practiced determining bond orders for diatomic molecules like H2, O2, and N2, and briefly discussed magnetic properties.

The session involved a review of the digestive system, with a primary focus on the structure, function, and regulation of the small intestine. The student revised key concepts related to digestion and absorption processes, including neural and hormonal control mechanisms. They also checked and finalized answers to questions.

The session covered the process of urine formation within the nephron and its role in fluid and electrolyte balance. The student and tutor discussed filtration, reabsorption, and secretion, with an emphasis on the loop of Henle and the collecting duct. The role of hormonal control in vascular homeostasis was also reviewed, and the student needs to submit their work tomorrow.