the animals

Question 1

how many known species

Answer 1

2.13 M known although some say its 1.5m

also around 7.8 M total species

Question 2

what percent of animals are arthropods

Answer 2

over 60%

Question 3

what percent of animals are vertebrates

Answer 3

less than 5%

Question 4

what one of the 6 kingdoms do animals belong to

Answer 4

opisthokonts

Question 5

what is the closest single cell relative to animals

Answer 5

choanoflagellates

Question 6

chanocytes

Answer 6

cells that occur in sponges (simplest extant of animals)

Question 7

how animals orginiated from choanoflagellates

Answer 7

first an aggregate (colony) of identical cells came together

some cells became specialized

cells formed layers by infolding

protoanimal formed w simple digestive cavity

Question 8

oldest animal fossil

Answer 8

575 Mya

Question 9

when did animals likely arise

Answer 9

850 M- 1.2 B years ago

Question 10

early animal forms were ____ and have been found in:

Answer 10

marine

south aus (ediacara hills) , china and canada

Question 11

what is the cambrian explosion

Answer 11

around 530 Mya, big diversification of animal body plans, includes oldest fossils

Question 11

hallucigenia

Answer 11

old fossil, original form ( by Simon Conway Morris) didn’t make much sense but then discovered (by Lars Ramskold who cut further into fossil) it was actually upside down and the head structure was actually just a smudge was most likely an onychophoran (velvet worm)

Question 11

how do we sort out animal phylogenetic relationships

Answer 11

look at comparative morphology, comparisons of embryology, fossil record and molecular sequence alignments

Question 12

metazoa are

Answer 12

multicellular

Question 13

metazoa have cellular differentiation, what does this mean

Answer 13

different cells have different functions

Question 14

do metazoa have cell cell cooperation

Answer 14

yes

Question 15

metazoa are all _______ which means they need nutrients from other organisms

Answer 15

ingestive heterotrophic

Question 16

metazoa are motile, what does this mean

Answer 16

they have spontaneous movement

Question 17

metazoa have homeostasis, what does this mean

Answer 17

they have a constant body environment, self regulation

Question 18

metazoa are diploidy, what does this mean

Answer 18

undergo meiosis at reproduction

Question 19

do all metazoa have an embryonic stage

Answer 19

yes

Question 20

around how many phyla of animals are recognized

Answer 20

35