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BY 123 Exam I Notes - Science to know Science based on...

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- Science- to know - Science based on natural phenomenon having natural causes. - Science requires evidence. - Use evidence to solve problems. - Science depends on observation and experimentation. - 1 st step to observation, is wanting to find something out. The tree is green. - Then you ask a question. Why is the tree green? - Refer to figure 1.19 - Observation Question Hypothesis (what we think will happen) Prediction Test - Must be able to replicate data in science. - The more data you have the more likely the data is a correct representation of what really happens. - You need lots of evidence in science. - After conclusions are drawn scientist publish findings. - Always be skeptical of all findings. - Need to be free of bias. - After a hypothesis has been test and found to be consistent with all relevant data; it becomes a theory. - Theory’s support multiple hypothesis. - Good theories bring hypothesis that don’t appear to be similar together. - When theories become very predictable, where math can be used to find correct answer it becomes a law. - There are many physical laws. Ex. Law of Diffusion - Not many biological laws. - Controlled Experiment o 2 groups- the experimental and the control group. o Experimental group contains the variable. - Make sure each group is alike. - Control group has everything constant. - Experimental group holds everything constant except the variable, which is what’s being tested. - Science is a body of information about the world collected through rigorous, critical, observation manners, and has been tested and re-tested. - Science deals with supported hypothesis not absolute truths. - Science can and does change. - It is not sciences role to answer moral or ethical questions. - What is Biology?- The study of life. - What is life? o Living things are highly organized |---------Living Organisms have these------| o Atoms Molecules Compounds Cells Tissue Organs Organ Systems o The dividing line between living in non-living is decided by whether or not it contains cells. - Refer to figure 2.1 - 3 Domains of Life- Refer to figure 26.15 o Domain Bacteria (Prokaryotes) o Domain Archaea (Prokaryotes) o Domain Eukarya (Eukaryotes) - 5 Kingdoms of Life o Prokaryotes- Unicellular, heterotrophs (obtain energy form other organisms) o Protista (not name anymore)- Eukaryote, Unicellular, heterotrophs, phototrophs
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o Plantae- Multicellular, autotrophs o Fungi- Multicellular (except for yeast), heterotrophs o Animalia- Multicellular, heterotrophs - 1 st criteria for if it is a living thing is if it has cells. - 2 nd criteria for if it is a living thing is if it utilizes energy. o Living things grow and maintain structure by taking in chemicals and energy from the environment. o Metabolism is a series of chemical reactions organisms use to attain their energy.
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