1-3 Studying Life

Controlled experiments Experimental design Responding variable Results/data theory begin with is followed by tested by include Used to evaluate Concept Map 1-2 Hypothesis formation A problem May become Controlled experiments Controlled var. Manipulated variables Make up Used to draw conclusions

Characteristics of Living Things Section 1-3 Characteristic Examples Living things are made up of units called cells. Many microorganisms consist of only a single cell. Animals and trees are multicellular. Living things reproduce. Maple trees reproduce sexually. A hydra can reproduce asexually by budding. Living things are based on a universal genetic code. DNA All living things share the same basic chemistry. A,T,G,C Living things grow and develop. Flies begin life as eggs, then become maggots, and then become adult flies. Living things obtain and use materials and energy. METABOLISM Plants obtain their energy from sunlight. Animals obtain their energy from the food they eat. Living things respond to their environment. Bird fly south in winter. Living things maintain a stable internal environment. HOMEOSTASIS Body discards wastes to make keep body stable. Taken as a group, living things change over time. EVOLUTION Bacterial resistance to antibiotics. Go to Section:

Branches of Biology – Levels of Organization Figure 1-21 Levels of Organization continued Branches of Biology – Levels of Organization Section 1-3 Organism Individual living thing Bison Tissues, organs, and organ systems Groups of Cells Nervous tissue Brain Nervous system Smallest functional unit of life Cells Nerve cell Groups of atoms; smallest unit of most chemical compounds Molecules Water DNA Go to Section:

Levels of Organization (cont) Figure 1-21 Levels of Organization Levels of Organization (cont) Section 1-3 Biosphere The part of Earth that contains all ecosystems Biosphere Ecosystem Community and its nonliving surroundings Hawk, snake, bison, prairie dog, grass, stream, rocks, air Community Populations that live together in a defined area Hawk, snake, bison, prairie dog, grass Population Group of organisms of one type that live in the same area Bison herd Go to Section:

Assignment Chapter 1 review page 31 (1,2,3,4,5,6,7,8,9, 12,13,15,16,18,19,20)