easy
what is the definition of a fossil?
the trace remains of an organism
name one place we can find fossils
answers will vary
defintion: contains all the fossils we have found so far
fossil record
name one thing that a pharyngeal pouch changes into
gills - fish
glands - humans
what part of an animal usually becomes a fossil
teeth, shells, bones
tell me why it is hard to become a fossil
have to be covered quickly
cannot fully decay
answers will vary
ex: when an organism has appeared or disappeared in time
what is the geologic time scale
studying the rocks to see how old the earth is
why do scientists study embryo's
to look at their similarities for evolution
what parts of an organism usually do not become a fossil
the soft parts
name one place, other than rocks, that I can find fossils
tar, glaciers, sap
what environmental changes can cause extinctions
earthquakes, climate change, tsunami's etc
give me an example of homologous structures - be specific
cat arm and human arm - both have same structure but different jobs
give me an example of analagous structures - be specific!
bird and butterfly wings - they both have same job but different function
give me an example of a vestigial structure
human appendix
charles darwin
how old is the earth
3.7 billions years old
name an example of a transitional species
name one way they age rocks
absolute dating
relative age dating
what are analogous structures
different structure same function
give me an example of comparative anatomy
bird and human bones
which one of these terms means that they came from one common ancestor instead of multiple: homologous structure or analagous structure (hint - think through the meanings and examples of these words)
homologous
what are homologous structures
same structure different function
how many mass extinctions do scientist think have happened on earth so far
5
what big envrionmental change are they fearing will end the world as we know it and could make us go extinct?
Yellowstone volcano eruption