Is this biology?

Is this biology?

Is this biology?

Is this biology?

Is this biology?

Is this biology?

Is this biology?

Biology Defined: the study of life Organism: anything that can carry on the processes of life Species: organisms that can reproduce in breed Over 2 million species More diverse along equator Life has been traced to over 3.5 billion years old

Is Fire Alive? no yes yes no yes yes Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment no yes yes no yes yes

Are Cars Alive? yes no no yes yes yes Made of cells 2) Reproduces 3) Grows and Develops 4) Has organization 5) Requires energy 6) Responds to environment yes no no yes yes yes

Life Characteristics All life (from bacteria to humans) has a few common characteristics 1) Based from cells Cell = most basic unit of life All cells capable of carrying on life processes Some cells specialized for specific duties Ex: Red blood cells carry O2

Life Characteristics 2) Requires energy Energy = ability to do work or cause change Energy controls metabolism (ability to break down materials) Most life energy obtained from the sun Autotrophs: create energy from the sun (ex: plants & algae) Heterotrophs: consumer others for energy (ex: fungi & animals)

Life Characteristics 3) Responds to environment Stimulus = environmental factors Ex: Sound, light, touch

Life Characteristics 4) Reproduces and develops Genetic material (DNA) passed to next generation Asexual reproduction: offspring produced from a single parent Offspring genetically identical to parent Sexual reproduction: offspring is a genetic mixture of two parents Offspring vary genetically from parents

Quick Review Life on Earth is very diverse All life has certain features in common Energy moves from one organism to another