BIOL 101 Chapter 1: Studying Life

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Frogs dramatic population decline: causes: pesticides and herbicides. Dr. tyrone hayes, grew up in south carolina: studied: atrazine = herbicide applied in spring, effects: atrazine feminized males. Population communities ecosystem biosphere: animals + plants can compete or cooperate for resources, discoveries in biology can be generalized, model systems = applying to others since all life share a common ancestor, eg. Most knowledge of photosynthesis come from experiments on. Fossil = the preserved remains of organisms that lived in the distant past, often have large age gaps: life arose from non-life via chemical evolution. 1. 3 how do biologists investigate life: observation is an important skill, electronic recording devices, microchips, electron microscope, mri, and satellites enhance the ability to observe the world. Improved quantitative observations b: the scientific method combines observation and logic, scientific method is also called hypothesis-prediction (h-p) method (five steps, making observations, asking questions, forming hypotheses (possible answers)

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