Ages of sand Douglas Adams divides the history of modern science into four ages:
1) First age- the principle investigative tool of this stage is the
2) Second age- microscope
3) Third age- computers
4) Fourth age- fiber optics (flexible, transparent fiber made of
glass or plastic, functions as a waveguide or light pipe to
transmit light between the two ends of the fiber
Biogeogrpahy Certain animals adapt into certain environments
Charles Darwin • He proposed five theories: 1. No constancy of species, 2. Common
ancestry, 3. Gradual change, 4. Multiplication of species, 5.
Natural selection. HE NEVER PROPOSED A THEORY ON
• No constancy of species- can be observed through variation in the
offspring. Ex. Different sized beaks in finches display variation in
the species and therefore, non constancy. This can cause change in
the gene pool of a species over time.
• Common ancestry- can be seen in the anatomy of different species
like homologies and vestigial structures. Ex. Hip bones in whale
are similar to humans which indicate the common ancestry
between the two species.
• Gradual change- displayed by the fossil records of many species.
Older fossil records have some small differenc