intro to phyla

Question 1

when was the Cambrian explosion

Answer 1

540 million years ago

Question 2

what is a phyla

Answer 2

a group of animals that are thought to share a common ancestor

Question 3

what are stromatolites

Answer 3

rocks formed of layers of fossilized cyanobacteria formed 3500 million years ago

Question 4

when was the first multicellular organism found and what was it

Answer 4

800 million years ago, and a multicellular algae

Question 5

what was the earliest eukaryote called and when were they found

Answer 5

acritarchs and 2100 mya

Question 6

what is an ediacarian fauna

Answer 6

the earliest known macroscopic multicellular organisms

Question 7

where is the best-known source of Cambrian explosion fossils

Answer 7

the burgess shale

Question 8

how many animal phyla are there

Answer 8

~35 FAGGOT

Question 9

what is the symmetry, body grade, and structure of Porifer

Answer 9

asymmetrical, cellular, unique

Question 10

what is the symmetry, body grade, and structure of cnidariae

Answer 10

radial, tissues but no organs, two layers

Question 11

what is the symmetry, body grade, and structure of other bilaterae

Answer 11

bilateral, organs, three layers