[DOC] [TLE] Trilobite - Wikipedia [PAR] Trilobites are a fossil group of extinct marine arthropods that form the class 
Trilobita. Trilobites form one of the earliest known groups of arthropods. The first 
appearance of trilobites in the fossil record defines the base of the ... By the time 
trilobites first appeared in the fossil record, they were already highly diversified 
and... [DOC] [TLE] The Evolutionary Arms Race - Examples Among Trilobites [PAR] Examples of the evolutionary arms race among the extinct Paleozoic trilobites ... 
and prey is a major selective force in evolutionary change in organisms. ... The 
prey population that fails to adapt to new weapons of the predator, risks its 
survival. ... The earliest trilobite eyes were, like modern arthropods, compound 
eyes,... [DOC] [TLE] Trilobite Eyes - trilobites [PAR] The Evolution of Sight Trilobite Eyes Holochroal Eyes Schizochroal Eyes ... And, 
why not, the survival advantage is enormous, and the early animals shared ... as 
they were probably the first animals with complex eyes, with some species ... in 
the fossil record already had complex, compound eyes with crystal lenses (calcite
). [DOC] [TLE] Free Flashcards about NATURAL HISTORY - StudyStack [PAR] TRILOBITES WERE AMONG THE FIRST CREATURES TO HAVE THESE; THEY 
WERE COMPOUND CRYSTALS THAT SURVIVE AS FOSSILS, EYES. [DOC] [TLE] Prehistoric Earth Lesson #15 - Volcano World [PAR] Fossils are the remains of plants and animals that have been preserved in ... 
Fossils can also be tracks and traces of these animals, or in some rare cases, ... 
Scientists believe that bacteria, viruses, fungi, and simple worms were also 
among the first life forms. ... Trilobites are very important to the dating of the 
Earth's layers. [DOC] [TLE] What is a Trilobite? - FossilEra.com - Fossils For Sale [PAR] Trilobites were an extinct marine arthropod that lived during the Paleozoic era. ... 
Trilobites evolved profound adaptations that place them among the most 
successful ... Most trilobites are one of the first animals known to have the sense 
of vision. They had compound eyes contained lenses made of calcite crystals, 
something... [DOC] [TLE] Trilobite Fossil Gallery: Facts and Information about Trilobites: What ... [PAR] They were already here before the Cambrian explosion, survived numerous 
mass ... The first "scientifically" described trilobite comes from Wan Shizen of 
China. ... First Compound Eyes: ... Many species have eyes that contain 
numerous lenses made of crystal! ... These include legs, gills, antenna, and other 
appendages. [DOC] [TLE] Trilobite - New World Encyclopedia [PAR] Dec 17, 2015 ... The trilobites are considered to be the first animals to have evolved true eyes. .... 
oriented, clear calcite crystal to form the lens of each of their eyes. In this ... In 
these compound eyes, the lenses were typically arranged hexagonally. ... They 
were among the first fossils to attract widespread attention, and new... [DOC] [TLE] Science Olympiad: Arthropods - The Virtual Petrified Wood Museum [PAR] Arthropods were the first animals to have jointed appendages. Joints permit ... 
Next to ostracodes they are the most common arthropod fossil. Trilobite means ... 
Trilobites have compound eyes made of calcite crystals. ... The lenses of these 
eyes must be viewed with the aid of magnification. ... They do not have antennae. [DOC] [TLE] Just-so Houston - Intelligent Design - WORLD [PAR] Nov 13, 2015 ... Among them: How the Camel Got His Hump (a djinn punished a lazy one) ... the 
trilobite, a three-part exoskeleton with articulated lobes and compound eyes. ... 
trilobites did not invent the eye, they were among the first animals to ... Few, if any
, living species have eyes as high-tech as these trilobite eyes.. [DOC] [TLE] Chapter 3: Fossils of the Midwestern US - Teacher Friendly Guide to ... [PAR] Fossils are also the most important tool for dating the rocks in which they are ... 
Most species have a lifespan of several million years; rarely do species exist ..... 
the evolution of photosynthesis, increasing amounts of oxygen were released ... 
and Minnesota preserve the hard parts of trilobites (Figure 3.4), brachiopods,. [DOC] [TLE] Arthropoda facts, information

Question: Trilobites were among the first creatures to have these; they were compound crystals that survive as fossils
Answer: eyes