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What actually separates the living from the non-living? In this episode, Alex and Marcus work through the core life processes—nutrition, photosynthesis, digestion, respiration, transport, and excretion—so the exam facts feel like a connected system rather than a list of disconnected terms. By the end, the body starts to look less like a collection of organs and more like a beautifully coordinated economy of energy and matter.
Alex and Marcus start with the hardest biological question of all: how do we define life? They focus on homeostasis, metabolism, and why viruses sit in the gray zone that exam questions love.
This chapter breaks down how organisms obtain material and energy. Alex and Marcus separate autotrophic from heterotrophic nutrition and then unpack the main heterotrophic modes that exam questions constantly test.
Alex and Marcus trace photosynthesis from the chloroplast to the Calvin cycle. They also emphasize the factors that limit the rate, which are classic exam material.
This chapter moves from unicellular feeding to the human digestive tract. The focus is on the sequence of digestion, absorption, and the key exam distinction that digestion is not finished in the stomach.