Biology I Chapter 1 Section 1.1, 1.2, 1.3

Biology
is the study of all livings things

Botany
the study of plants.

Zoology
is the study of animals

Ecology
is the study of the interactions between organisms.

6 themes of biology
cell structure and function
Strategies for maintaining homeostasis
Reproduction and Heredity
Evolution
Interdependence of organisms
Need for energy

organism
is a living thing.

unicellular organism
is a living thing composed of one cell.

multicelluar organism
is a living thing composed of more than one cell.

Differentiation
different cells, different organs, different systems.

homeostasis
The regulation of an organism’s internal environment to maintain conditions suitable for life

Reproduction
is the production of offspring.

gene
is a segment of DNA that is located in a chromosome and codes for a specific hereditary trait.

Evolution
is the gradual change in the characteristics of species over time.

ecosystem
is a community of organisms and their non-living environment.

Autotrophs
are organisms that produce their own nutrients from inorganic substances or from the environment instead of consuming other organisms.

Heterotrophs
are organisms that obtain organic food molecules by eating other organisms or their byproducts

cell
is the smallest unit of life that possesses all of the characteristics of life.

development.
The process by which an adult organism arises

Development
produced by the repeated cell divisions and cell differentiation.

Reproduction
the production of offspring

Species
a group of similar looking organisms that can be interbreed and produce fertile offspring.

data
all information collected

steps of scientific method
-Step 1- Ask a Question
-Step 2- Form a hypothesis
-Step 3- Design and construct an experiment
-Step 4- Analyze the results
-Step 5- Draw a conclusion

what is Making observations
using one or more of the five senses

Asking a question
sampling and organizing data

Form a hypothesis
explains observations and can be tested

controlled expeiriment
is an experiment that tests only one factor at a time by comparing a control group with an experimental group.

variable
is a factor that changes in a controlled experiment.

Independent variable
manipulating variable= changing variable

Dependent variable
responding variable

Theories
are explanations for some phenomena based on observation, experimentation, and reasoning.

Laws
are summaries of many experimental results and observations.

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