explain late paleozoic old red continent and placoderm

Part A

Late Paleozoic: help explain late Paleozoic and describe its importance to today’s earth? (Is there a certain event that affected todays earth landscape, ecosystems, atmospheric conditions, life, etc.)

Part B

http://csmres.jmu.edu/geollab/vageol/vahist/oldredcont.htm

using the web page above of the Middle and Late Devonian “Old Red Continent” (ORC)

How was the ORC formed?

Where was the equator at this time and what were the prevailing winds like at this time?

Part C

http://www.ucmp.berkeley.edu/vertebrates/basalfish/placodermi.html

Per the web page above:

What is the nature of an placoderm?

What is the geological range of this fish?

Why was bony armor of importance to such fish at this time in geological history?