Chapter 1 Humans In The World Of Biology

The Scientific Method Scientific Method –A procedure that is used to solve problems or answer questions. –A way of thinking and looking at the world. –A technique used to gather information and reach conclusions.

Steps to the Scientific Method Observation Hypothesis PredictionExperiment Analyze Results Conclusions If the results do not support hypothesis Then revise the hypothesis If results support hypothesis Then make new predictions and test them

Scientific Method continued Reproducibility- repeat experiments. Publication- publish experiments in a peer reviewed journal. Scientific Theory- a broad-ranging explanation for some aspect of the universe that has been repeatedly confirmed through hypothesis testing.

Scientific Method and Research Clinical trials- medical studies on humans.

All Living Things Share Basic Characteristics

Living things contain nucleic acids, proteins, carbohydrates, and lipids

Living things are composed of cells

Living things reproduce

Living things metabolize

Living things respond

Living things maintain homeostasis

Populations of living things evolve and have adaptive traits

Levels of Organization Tissue Level Ecosystem Level Molecular Level Individual Level Biosphere Level Organ System Level Cellular Level Community Level Population Level Organ Level Molecular Level Cellular Level Tissue Level Organ Level Organ System Level Individual Level Population Level Community Level Ecosystem Level Biosphere Level

Molecule The chemical components of cells Cell Tissue Organ System Individual The basic unit of life Group of similar cells that perform a common function Two or more different tissues that perform a common function Group of related organs that have a common function A single organism

Individual A single organism Population Community Ecosystem Biosphere All individuals of the same species that occupy a given area All the species in an ecosystem that can interact A community and its physical environment The part of the earth that supports life

Classificaton of Humans- Homo sapiens L Animalia Chordata Vertebrata Mammalia Primates Hominidae Homo sapiens