BIOL 1001 Chapter : Biology Notes Ch 1
Document Summary
Characteristics of living things: complex and organized. Water flea; organized and complex: they acquire materials and energy from their surrounding environment. Plants utilize co and sunlight to make sugars. Animals eat plants to obtain sugars for energy: they work to maintain their internal conditions. Homeostasis means staying the same : sweating when hot; shivering when cold, feeling thirsty when water is low. Homeostasis requires energy: opposes natural trend to disintegration, obtained from external source. Homeostasis requires physical repair: parts break down, new materials required for repair. Extension of homeostasis: growth = homeostasis plus extra. Must acquire more than needed for homeostasis. Changes in internal environment: temperature, water level, blood sugar level. Changes in external environment: seek food and water, avoid bitterness, plants grow towards light, reproduction. Perpetuation of parents" genetics: genetic info stored in dna molecules, variation. Simple code with complex error correction system: evolution. Genetic composition of population changes (evolves: differential survival (natural selection, selects advantageous adaptations.
