Pre Cambrian Life

Question 1

Possible early fossil

Answer 1

Archean Stromatolite
A string of what may be prokaryotic cell

Question 2

believed to be resting stages of eukaryotic planktonic algae
similar to modern dinoflagellates, represent the oldest body fossils at 2.5
billion years

Answer 2

Acritarchs

Question 3

COMPOSED OF EUKARYOTIC CELLS.
THEIR ORIGIN MUST THEREFORE POSTDATE THE
ORIGIN OF THIS CELL TYPE

Answer 3

MULTICELLULAR ANIMALS

Question 4

THE OLDEST COMMON AND WIDELY ACCEPTED METAZOANS ARE MEMBERS OF THE

Answer 4

EDIACARAN FAUNA.

Question 5

REPRESENTS THE OLDEST, WELL KNOWN, DIVERSE SET OF MULTICELLULAR ORGANISMS.
THEY ARE DISTRIBUTED IN ROCKS FROM JUST ABOVE THE TILLITES OF THE LAST PRECAMBRIAN GLACIATION TO THE PRECAMBRIAN-CAMBRIAN
BOUNDARY

Answer 5

EDIACARAN FAUNA

Question 6

STRUCTURALLY, THREE GROUPS OF ORGANISMS SEEM TO BE PRESENT IN THE FAUNA:

Answer 6

(I) THOSE WITH RADIAL SYMMETRY, WHICH MAY
BE RELATED TO JELLYFISH OR CORALS;
(II) THOSE WITH BILATERAL SYMMETRY,
POSSIBLY RELATED TO MORE ADVANCED
ORGANISMS SUCH AS WORMS OR ARTHROPODS;
AND
(III) THOSE WITH AN UNUSUAL SYMMETRY THAT
MAY NOT BE REPRESENTED BY LIVING GROUPS.

Question 7

AN EXAMPLE OF THE RADIAL GROUP OF SPECIES IS_______________, AN ORGANISM WITH CONCENTRIC RINGS, POSSIBLY A JELLYFISH.

Answer 7

CYCLOMEDUSA

Question 8

AN EXAMPLE OF THE BILATERAL GROUP IS

Answer 8

SPRIGGINA

Question 9

IS AN ORGANISM THAT CAN BE
INTERPRETED AS EITHER A MEMBER OF A
MODERN GROUP OR SOMETHING TOTALLY
DIFFERENT

Answer 9

DICKINSONIA