properties of life what characteristics do living creatures have in common?

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  • Properties of Life What characteristics do living creatures have in common?
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  • carbohydratesproteins Living creatures are ORGANIZED All made of the same collection of chemicals, but we are organized as molecules proteins, fats, carbohydrates, nucleic acids DNA
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  • Living creatures are ORGANIZED All made of the same collection of chemicals, but we are organized as organelles & cells plant cells & animal cells animal cell plant cell
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  • Living creatures are ORGANIZED All made of the same collection of chemicals, but we are organized as organs & organ systems respiratory, circulatory, digestive, etc.
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  • Living creatures RESPOND Respond to internal changes Homeostasis maintaining balanced conditions inside the body Respond to external changes
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  • Living creatures use ENERGY mitochondria Metabolism all the reactions your body performs to make & use energy eating & digestion & elimination of waste synthesis = building cellular respiration = making energy
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  • Living creatures GROW & DEVELOP Change over an individuals life time get bigger mature so they can reproduce
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  • Living creatures REPRODUCE Make the next generation
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  • Scientific Method Its how we think about the world around us
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  • Scientific Method is AA n organized approach to asking questions and making discoveries. TT he way that scientists (and many non-scientists) think about problems that they encounter.
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  • Scientific Method: Observation Problem Hypothesis Experiment Data Conclusion Theory
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  • Observations: or Information gathered using the five senses or tools
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  • Problem: A question one might ask based on the observations that are made.
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  • Hypothesis A possible explanation of the problem that we wish to test. (it doesnt have to be correct!!) Many hypotheses can be made they predict the outcome of an experiment.
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  • Experiment This video shows an impact experiment of a high-speed impact into a frozen comet-like material (dust, ice, window cleaner and Worchestershire sauce) over a highly porous target (garden perlite). The impact makes a small hole in the comet, simulating a strength-controlled crater, but a large crater grows below and peals back the surface crust like petals of a flower. The result is similar to a deeply buried explosion. Credit: NASA An organized test of a hypothesis.
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  • Data The results of experiments. Data can be expressed as numbers or descriptions. Example: the elephant is 3 meters tall.
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  • Conclusion What has been learned from the experiment. Conclusions are supported by data.
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  • Theory A broad explanation of natural events that is strongly supported by a body of evidence - time tested by many people. Example: The theory of gravity
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  • Some other scientific method terms Inference a possible explanation based on an observation. Opinion What someone thinks about something. We try to keep this out of science!
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  • Some other scientific method terms Control What we compare our data against. (usually helps to show what we already know)
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  • Some other scientific method terms Variable that which is manipulated in an experiment to get a result.
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  • Some other scientific method terms Independent Variable When this changes, it results in change in the other variable. Dependent Variable - That which changes as a result of a change in the ind. Variable.
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  • Validity: A good experiment should. Be easily repeatable. Have a large sample size Control for as many variables as possible.
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  • Graphing Your Data Showing patterns & trends A picture is worth a thousand words!
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  • Types of data (information) Variables what you measure in an experiment dependent variable measured variable unpredictable change: we dont know how it will change until we do the experiment Y-axis independent variable manipulated variable predictable change: it only changes because we chose how it would change X-axis The effect of _____________ on _____________ INDEPENDENT DEPENDENT
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  • Examples of experiments 1 How does fertilizer affect the growth rate of plants? we set up an experiment testing different amounts of fertilizer on different plants & measuring the growth (height) of the plants: dependent variable (Y-axis)? height of plants independent variable (X-axis)? amount of fertilizer The effect of _____________ on _____________ Amount of Fertilizer Height of Plants
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  • Examples of experiments 2 How does exercise affect heart rate of 10th grade student? we set up an experiment testing different lengths of time of exercise (minutes) on the heart rate of students: dependent variable (Y-axis)? heart rate independent variable (X-axis)? minutes of exercise The effect of _____________ on _____________ Exercise Heart Rate
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  • Examples of experiments 3 Whats the favorite drink of students? we set up an experiment surveying students and asking which is their favorite drink : dependent variable (Y-axis)? number of students independent variable (X-axis)? type of drink The effect of _____________ on _____________ Type of Drink How many students chose it
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  • Making pictures out of data Graphs line graphs graphing data that shows continuous change bar graphs (or histograms) graphing data that is in disconnected groups Hows a critter to choose?
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  • How does elevation affect temperature? elevation temperature 5 10 15 20 25 30 05001000150020002500 0 elevation (feet above sea level) temp. (C) 030 50025 100020 150015 200010 25005 1200 ft? 1818 Line graph! 1200
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  • Which drink do you like best? type of drink number of students 1 2 3 4 5 6 CokePepsiwaterteaGatorade 0 drinknumber Coke1 Pepsi1 Water4 Iced tea4 Gatorade3 Bar graph!
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  • name and date Title: Descriptive title explaining the purpose of the experiment. Purpose: The question being answered in the experiment. Lab Report Template
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  • Hypothesis: What you believe will happen, in the form of an If, then statement. Lab Report Template
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  • Materials: List all materials used in the lab Procedure: List step by step how to complete the lab Data: Independent and Dependent variable listed Lab Report Template
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  • Analysis: At least a paragraph that explains what your data shows Conclusion: Ties lab together. Is hypothesis supported or refuted? Include any suggestions for improving the experiment. What could have been a source of error and give a suggestion for further research. Lab Report Template


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