Master the Fundamentals of Biology (Part 3 & 4 of 4) NEW

Explore trophic levels from producers to apex predators, mapping food chains and food webs among producers, consumers, and decomposers. Analyze interdependence and how changes in one species ripple through ecosystems.

Explore energy transfer in food chains and food webs. Understand that only about 10 percent of energy moves to the next trophic level, with losses to heat, movement, and feces.

Explore population pyramids by analyzing pyramids of number and biomass, showing producers at the base and each trophic level stacked above.

Explore how carbon and other substances move through ecosystem components via the carbon cycle and nitrogen cycle, highlighting respiration, photosynthesis, decomposition, and combustion that release carbon dioxide.

Explore the nitrogen cycle, from atmospheric nitrogen to plant-usable compounds, through nitrogen fixing bacteria, decomposition releasing ammonia, nitrifying bacteria forming nitrates, and denitrifying bacteria returning nitrogen to the air.

Human expansion drives air pollution from burning fossil fuels, releasing carbon monoxide and sulfur dioxide, causing acid rain that reduces fishery production, and harms algae, plants, and soil mineral uptake.

Explores how human activities increase greenhouse gases like carbon dioxide, methane, nitrous oxide, and CFCs, triggering the greenhouse effect, climate change, sea level rise, and biodiversity loss.

Human activities introduce excess nitrates and phosphates from fertilizers and sewage, causing eutrophication that fuels algae blooms, blocks light, depletes oxygen, and leads to fish kills.

Increase crop yield by optimizing light, temperature, water, and carbon dioxide inside greenhouses or poly tunnels, using fertilizers and pest control to boost photosynthesis and biomass.

Explore pest control in crop production by comparing chemical pesticides with biological controls, including predators like ladybirds and parasites, and discuss advantages, drawbacks, resistance, and environmental impacts.

Explore how microorganisms ferment food, using bacteria to make yogurt from milk via sterilization, pasteurization, Lactobacillus incubation, and lactose conversion to lactic acid.

Explore how yeast, a single-celled fungus, converts sugar to carbon dioxide during aerobic respiration to make bread rise, while enzymes break down starch and alcohol is burnt away.

Industrial fermenters enable large-scale production of foods and insulin by controlling culture medium for microorganisms, temperature with a water jacket, paddles for mixing, pH, oxygen supply, and sterilization between batches.

Master selective breeding by choosing individuals with desirable traits and breeding them across generations to enhance milk production, meat quality, and crop resilience.

Explore fish farming as a scalable method to supplement ocean fish stocks, covering water quality management, oxygenation, waste control, feeding strategies, disease prevention, and selective breeding to maximize yield.

Examine cloning as a way to produce genetically identical organisms, including natural asexual reproduction in Hydra and artificial plant clones through micropropagation.