4.8 Key Ideas Flashcards
(8 cards)
What is the cell theory?
All living organisms are composed of cells; the cell is the basic unit of life; all cells arise from pre-existing cells.
What is the role of enzymes?
Enzymes are biological catalysts that speed up chemical reactions without being consumed functioning optimally at specific temperatures and pH levels.
What is the importance of diffusion?
A passive transport process where particles move from an area of higher concentration to one of lower concentration essential for gas exchange and nutrient uptake.
What is the significance of the circulatory system?
It transports oxygen nutrients, hormones, and waste products throughout the body, maintaining homeostasis.
What is the role of the immune system?
It defends the body against pathogens through physical barriers immune cells, and the production of antibodies.
What is the principle of evolution?
Species change over time through natural selection where advantageous traits become more common in the population.
What is the impact of human activity on ecosystems?
Human activities like pollution, deforestation, and urbanization can disrupt ecosystems, leading to loss of biodiversity and climate change.
What is the importance of sustainable development?
Meeting the needs of the present without compromising the ability of future generations to meet their own needs ensuring resource availability and ecosystem health.
