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The Tutor and Student reviewed the properties of water as a universal solvent and the structure of water molecules, focusing on polarity and bonding. The Student practiced drawing electron dot formulas and valence structures for different molecules, including hydrocarbons and nitrogen. The Tutor assigned activity 6.1 to practice drawing electron dot formulas and valence structures for a range of molecules, and they scheduled a follow-up session to discuss molecular shapes and VSEPR theory.

The Student reviewed key concepts in biodiversity, ecosystems, and classification, focusing on Australian examples. They discussed genetic and species diversity, biomes, and the impact of human activities on ecosystems. The Tutor provided clarifications and examples to reinforce understanding, and assigned chapter reviews for further study in preparation for the exam.

The Tutor introduced the Student to the fundamentals of cell biology, covering cell theory, prokaryotic versus eukaryotic cells, and basic cell structures. They discussed the structure and function of cell membranes, including the concepts of selective permeability, hydrophobic and hydrophilic interactions, and the roles of proteins and carbohydrates. The session concluded with an overview of hypertonic, hypotonic, and isotonic solutions.

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.