Presentation on theme: "Themes of Biology Biology CPA Miss Colabelli. Biology The study of life Biologists study the smallest organisms, like bacteria, to large animals like."— Presentation transcript:
Themes of Biology Biology CPA Miss Colabelli
Biology The study of life Biologists study the smallest organisms, like bacteria, to large animals like elephants Many different types of biology Nutritional Micro Pathology
Characteristics of Life All living things have similar qualities Broken down into 7 characteristics of life Organization Response to stimulus Homeostasis Metabolism Development Reproduction Evolution
Organization Degree of order when an organism’s internal and external parts Each living organism is made of one or more cells Cell tissue organ organ system organism
Response to Stimuli Living organisms have the ability to respond to a stimulus Can be a physical change In response to the environment Necessary for an organism to survive in their environment and stay alive
Homeostasis Organisms must maintain an internal balance Due to environmental change Regulatory system in order to keep balance Body temperature Salt intake and water intake
Metabolism Organisms need to make energy from their environment Humans eat food in order to get energy Plants make their food from the sun and water
Growth and Development All living things grow and increase in size Done by division and making new cells Cell division is when one cell is made from a pre-existing cell Development is the process of an organism maturing into an adult
Reproduction Process of living things producing themselves Essential for continuing a species Some organisms lay eggs, some have a baby grow internally The process of two organism passing their DNA to its offspring is sexual reproduction Two parents one or more organisms The process of one organism making an identical copy of itself is asexual reproduction One parent 2 daughter cell
Evolution Change over time Populations of an organism can change based on environmental conditions Important for survival in a changing world
Diversity & Unity of Life All living things have features that are common
Tree of Life
How scientists organize organisms into groups that are similar to each other Scientists believe we descended from one common ancestor (the roots)
Tree of Life The common ancestor branched out into diverse species Organisms change due to their environment
Three Domains of Life
Interdependence Organisms interacting with each other Ecology is the study of organisms interacting with each other When ecologists study organisms in a specific environment it is called an ecosystem
Human Impact Humans have been on earth for a very small amount of time Our impact on the planet has been drastic Think of some environmental changes humans have caused…
Evolution of Life Organisms change over time BUT their genetic characteristics do not Populations that change over time is known as evolution
Evolution Descent with modification when inherited traits within a population Small changes over a long period of time that a new genetically distinct new species can arise Tree of life is a symbol for this evolution over time
Natural Selection Organisms that have favorable traits are better able to survive and pass on their traits to next generation
What do you see?
Black & Peppered Moths
Adaptation Traits that improve an individuals ability to survive White rabbit and short ears in snowy place The individuals that survive are able to pass on traits to next generation
Analyzing Graphics Would you think that Archaea are more closely related to Bacteria or Eukarya?
Review Why is evolution important in helping explain the diversity of life? What is the difference between evolution and natural selection?
Make a hypothesis Fossil evidence shows that bats descended from shrewlike organisms that could not fly. Write a hypothesis for how natural selection might have led to flying bats.
Designing and Experiment Scientific Method Observation Question Form a hypothesis Experiment Data collection and analysis Conclusion
Observation and Question Begins with observing something in nature 2 types of observation Qualitative – using senses Quantitative – measurement Wondering how or what about it Ex: Observation: Owls capture prey in the dark Question: How do owls detect prey in the dark?
Hypothesis Possible answers for question in mind that you can test with an experiment Educated guess of how something occurs Can be more than one Ex: Owls hunt in the dark by vision Owls hunt in the dark by hearing Owls hunt in the dark by sensing body heat
Experiment Design an experiment to test your hypothesis Controlled experiment Control group What you compare data to Experimental group What you are testing for Independent variable What is being tested for (ex: presence or absence of light) Dependent variable How the experiment responds (ex: if the owl can catch its prey)
Collecting/Analyzing Data Collecting Data Usually quantitative data Compare experimental results to controlled results Analyzing Data Compare results to other studies and refine hypothesis Create charts, graphs, tables to show data
Conclusion Either supports or rejects your original hypothesis If it supports Can move on to construct a theory with research If it rejects Refine and change hypothesis and create new experiment