WHAT IS SCIENCE An organized way of gathering

WHAT IS SCIENCE? An organized way of gathering and analyzing evidence about the natural world.

WHAT IS SCIENCE? Science is a way of observing l “ “ a way of thinking l “ “ a way of knowing l

WHAT IS SCIENCE? l Science only deals with the Natural World. l Never concern the supernatural phenomena of any kind

WHAT IS SCIENCE? l Scientist collect and organize information in an orderly way l Looking events for patterns and connections among

WHAT IS SCIENCE? l Scientist propose explanations that are based on evidence. l Then test those explanations with more evidence

SCIENCE l Scientific knowledge helps us cure disease, place satellites in orbit, and send instantaneous electronic communications

SCIENCE Science continues to advance l Science not only understands what we “know” l But also what we don’t know l

Biology The Study of Life

Biology… l Explores life from the global to the microscopic. l This is an enormous amount of information!

To Study Biologist divide this information into different levels of organization. Biosphere l Consist of all parts of the planet that are inhabited by living things.

Biosphere Includes: l Most areas of land l Most bodies of water l Several kilometers up into the atmosphere l Even from space you can see all the green…. . That is LIFE!

Ecosystems l The community of living things in an area, along with nonliving features of the environment that support the living community. Sunlight Water Air Soil

Ecosystems vary widely: All of Earth’s ecosystems combined make-up the biosphere

Organisms l Individual living things l Interactions among the organisms of a community make each ecosystem dynamic place.

Cells Life’s basic unit of structure and function. l All organisms are made – up of 1 or more cells.

Atoms The basic building blocks of all materials both living and nonliving. l Atoms bond together forming molecules.

DNA Deoxyribonucleic Acid The chemical responsible for inheritance l Contains instructions for a cell to make all other molecules it needs to function Genes – Units of inherited information

Biology Explores Life at its Many Levels

Themes that unify the study of life…. Form & Function How something works is related to its structure. – Form fits function Form and function are everywhere

The Characteristics of Living Things Reproduce All organisms reproduce. – They produce new similar organisms Sexual Reproduction – Cells from two parents unite to form the first cell of a new organism Asexual Reproduction – a single organism produces offspring identical to itself.

The Characteristics of Living Things Interaction with the Environment We are not isolated from our environment, No One Is! – All organisms in an environment interacts continuously with its environment. Stimulus – a signal to which organism responds

The Characteristics of Living Things Energy Moving, growing, reproducing, and other activities of life require organisms to perform work. Work depends on a source of energy – We obtain energy in the chemical form, sugar, fats, etc. Metabolism – the combination of chemical reactions through which an organism builds up or breaks down materials

The Characteristics of Living Things are Made of Cells • Organisms are composed of one or more cells • • The smallest units considered fully alive. Cells can grow Respond to the environment Despite their small size they are highly organized

The Characteristics of Living Things Regulation Organisms have the ability to regulate their internal conditions – Sweating on a warm day – Dogs panting to cool off Homeostasis – internal stability or “steady state” maintained by the body Mechanisms of homeostasis enables organisms to regulate internal environment, despite changes in their external environment.

The Characteristics of Living Things Adaptation and Evolution • Taken as a group living things evolve. • Over generations, groups of organisms evolve, or change over time

The Characteristics of Living Things Living things Grow and Develop – During development a single egg divides again and again – As cells divide they differentiate They begin to look different – They perform different functions

The Characteristics of Living Things are Based on a Universal Code – All organisms store the information they need to live, grow, and reproduce in a genetic code written on a molecule called DNA. – This information is passed from parent to offspring

Biology & Society Biology changes our lives daily – New findings in DNA affect medicine – Studying the process of evolution help scientist understand how bacteria become resistant to antibiotics Everyday you can find a “current” story on Biology/Science and how it affects our lives: – – Global warming Pollution Stem cell Research On and on………