Question

2025 academic biology final review study topics & d

1. levels of organization smallest to largest:
2. levels of organization definitions from above:
3. definition of homeostasis.
4. difference between food web & food chain:

Explanation:

For question 29 (Levels of organization smallest to largest): In biology, the levels of biological organization from smallest to largest are typically: atom, molecule, organelle, cell, tissue, organ, organ system, organism, population, community, ecosystem, biome, biosphere.
For question 30 (Levels of organization definitions from above): Each level has a specific definition. For example, a cell is the basic unit of life; tissue is a group of similar cells working together; an organ is a structure made of different tissues with a specific function, etc.
For question 31 (Definition of homeostasis): Homeostasis is the ability of an organism or a cell to maintain a stable internal environment despite changes in the external environment. It involves processes to regulate factors like temperature, pH, and nutrient levels.
For question 32 (Difference between food web & food chain): A food chain is a linear sequence of organisms where each is eaten by the next (e.g., grass → grasshopper → frog → snake). A food web is a complex network of multiple interconnected food chains, showing all possible feeding relationships in an ecosystem.

Answer:

1. Atom, Molecule, Organelle, Cell, Tissue, Organ, Organ System, Organism, Population, Community, Ecosystem, Biome, Biosphere
2. (Example definitions) Atom: Basic unit of matter; Molecule: Group of atoms bonded together; Cell: Basic unit of life; Tissue: Group of similar cells with same function; Organ: Structure of different tissues for specific function; Organ System: Group of organs working for a function; Organism: Individual living thing; Population: Group of same species in area; Community: All species in an area; Ecosystem: Community + non - living environment; Biome: Group of ecosystems with similar climate; Biosphere: All life on Earth + its environments
3. Homeostasis is the ability of an organism (or cell) to maintain a stable internal environment despite external changes, regulating factors like temperature, pH, and nutrient concentrations.
4. Food chain: Linear sequence of organisms (A→B→C→…, one - way energy flow). Food web: Complex network of multiple food chains (interconnected, shows all feeding relationships in an ecosystem).