based on Indiana's Academic Standards, Science,
as adopted by the Indiana State Board of Education, Nov 2000.

numbers refer to the age-appropriate grade-level for the content.

Review

the Invasion of Land,
Part 2

grades secondary: to college:

Hypothesis:

• a lobe-finned lungfish crawls out to eat plants,
  • but needs legs (lobe-fins) to walk on beach
  • and needs lungs to breathe air
• these new animals are Amphibians,
  • class Amphibia, phylum Chordata
  • but not until the Devonian (400-350 Myr BP)

Or ... maybe they migrated onto land to eat the insects that were already there

2^nd Hypothesis:

• beach (mud flat)
  Silurian (440-400Myr BP)
  • covered by plants Rhynia & Cooksonia,
• crayfish-like creature (similar to sowbug) crawls out to eat plants
  • class Crustacea (subclass Isopoda), phylum Arthropoda
  • Silurian (440-400 Myr BP)
• mutates to become a cockroach-like creature
  • class Insecta, phylum Arthropoda
  • also during the Silurian (440-400 Myr BP)

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