Recognizing life’s characteristics and the methods used to study life provide a basis for understanding the living world. Why is that important?

Reminder Bio = Bio = Logy = Logy =

What does the Text have to say? Read together, pages Read together, pages 3 -10

The Characteristics of life

Notes Biologists study Biologists study –Interactions between living things –Interaction between living things and their environment –Problems or questions about living things and/or their environment

The Characteristics of Life An Organism: Anything that has ALL the characteristics of life. An Organism: Anything that has ALL the characteristics of life. 1) Must have one or more cells that contain DNA

The Characteristics of Life 2) Living things carry out reproduction Reproduction: Production of offspring Reproduction: Production of offspring Species: Group of organisms that can interbreed and produce fertile offspring Species: Group of organisms that can interbreed and produce fertile offspring

The Characteristics of Life 3) Living things grow and develop Growth: an increase in the amount of living material and the formation of new structures Growth: an increase in the amount of living material and the formation of new structures

Characteristics of Living Things 4) Living things adjust to their environment Environment: the air, water, weather, temperature, other organisms in the area Environment: the air, water, weather, temperature, other organisms in the area Stimulus: anything that causes an organism to react Stimulus: anything that causes an organism to react Response: the reaction of an organism to a stimulus Response: the reaction of an organism to a stimulus Homeostasis: the control of an organisms internal system to maintain the conditions for survival Homeostasis: the control of an organisms internal system to maintain the conditions for survival

Together… List the ways the human body maintains homeostasis… List the ways the human body maintains homeostasis… –Sweating –Shivering –Heavy breathing when excited, or exercising –Increased Heart rate

Characteristics of Living Things 5) Living things need energy Energy: the ability to cause change or do “work” Energy: the ability to cause change or do “work”

Characteristics of Living Things 6) Living things adapt and evolve –Adaptation: A body structure, behavior, or internal process that allows an organism to respond to its environment and survive to produce the greatest number of offspring.

Homework The Martian and the Car The Martian and the Car –In Marty’s defense… –What Marty missed…

What is Biology Worksheet Worksheet Worksheet –Questions 1-15

Wednesday Question of the Day… Wednesday Question of the Day… Wednesday Question of the Day… Wednesday Question of the Day…

The Methods of Biology Describe a way that a baker might conduct a controlled experiment with a cookie recipe. Describe a way that a baker might conduct a controlled experiment with a cookie recipe.

Scientific Inquiry (sometimes called the scientific method) Science is a process of thinking critically, using observations, inferring, comparing, contrasting and looking for cause and effect. There are several skills you must learn when you are setting out to study something in a scientific way.

Skills you will use during this class Investigating Investigating Observing Observing Analyzing Observations Analyzing Observations Inferring Inferring Predicting Predicting Hypothesizing Hypothesizing Interpreting (Analyzing) Data/Observations Interpreting (Analyzing) Data/Observations Making a Conclusion Making a Conclusion

Investigating Investigating is finding out the cause of a situation or event. Investigating is finding out the cause of a situation or event. –Major events, such as weather changes, or ecosystems are normally too big to study, so we break it down into variables. Usually when we investigate we start with a research question and a hypothesis. Usually when we investigate we start with a research question and a hypothesis.

Investigating Living Things Giant Fleas

Observing: Using your senses to pay close attention. You can observe in two ways. Qualitative: Looking for the “qualities” of an object or results. Usually made with your senses. “Anecdotal evidence” Not Exact Quantitative (Measuring): Finding the amount or specific size of something. Exact measurements OBSERVATIONS use your SENSES, you should NOT interpret them. We will get to interpret them later!

Observations of Fleas List four observations. List four observations. –Make two Qualitative observations, and two Quantitative observations of what is occurring in the flask –Share your observations –Add any that aren’t already on your list List three questions that you have, based on your observations List three questions that you have, based on your observations –The questions should be open-ended, not answerable by yes or no. –Share some questions –Are any of these testable?

Inferring: Explanation for observations – must be logical and make sense based on observations. “A hunch” “A hunch” –Inferences are made without performing experiments or tests.. Remember, in an inference you are using your experiences to interpret your observations (your brain is involved here!)

Write down some inferences about our Fleas

Hypothesizing: A hypothesis makes a prediction about how one variable (the independent variable) will affect another variable (the dependent variable). 1. Can be tested*. 2. Usually presents a possible solution to a research question. Example Research Question: Do bouncy balls with greater density bounce higher? Example Hypothesis: The density of a bouncy ball does not affect* the height of it’s first bounce. *testable

DRY MIX Dependent Dependent Responding/Results Responding/Results Y axis Y axis Manipulated Manipulated Independent Independent X axis X axis

Hypothesis Remember, a hypothesis is a testable prediction that suggests a change in the results (dependent variable), based on a change in the conditions (independent variable). What is a hypothesis we might make? What is a hypothesis we might make? –You must be able to say if it is correct or incorrect Why?

Experiment List the steps for a procedure we might do to test our hypothesis. List the steps for a procedure we might do to test our hypothesis.

Analyze Results What did we find out? What did we find out?

Conclusion On the back, write a conclusion about what you “discovered”. On the back, write a conclusion about what you “discovered”.

Experiments, Theories and Laws Theories take evidence from many experiments and organize them Experiments test one prediction and eventually document a trend or common theme Laws are statements that are known to be true

Experiments, Theories and Laws Experiment: an investigation that tests a hypothesis Experiment: an investigation that tests a hypothesis Control group: a part of the experiment that receives no experimental treatment Experimental group: the part of the experiment that changes, the Independent variable or Manipulated variable.

Experiments Theories and Laws Theories are explanations for an observed phenomenon. Theories are explanations for an observed phenomenon. –A Theory is a hypothesis that is supported by a large body of evidence.

Experiments, Theories and Laws Laws are facts of nature, also called principles Laws are facts of nature, also called principles –These are generally known to be true –Examples: Law of Gravity Law of Gravity Law of Conservation of Energy Law of Conservation of Energy