Review of Intro To animals Animals 3 characteristics Multicellular eukaryotic no cell wall An animals body plan can range from small few cell types ex sponge to large tissues and organs ex vertebrates ID: 930838
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Slide1
BIOL 211 SI
September 18, 2017
Review of Intro To animals
Slide2Animals
3 characteristics: Multicellular, eukaryotic, no cell wall
An animals body plan can range from small (few cell types ex: sponge) to large (tissues and organs ex: vertebrates)
3 different types of skeletal systems: hydrostatic, exoskeleton, endoskeleton
All animals (besides sponges) have neurons and muscle cells
Slide3Germ Layers
Diploblast vs
Triploblast
Diploblast has 2 germ layers: ectoderm and endoderm
Triploblast
has 3 germ layers: ectoderm, mesoderm, and endoderm
Ectoderm – skin and nervous system derived from ectoderm
Mesoderm – both muscle and bone is derived from mesoderm
Endoderm – digestive tract and associated organs derived from endoderm
Slide4Importance of Animals to Human Welfare
Humans depend on animals for
food
M
edical
science (painkiller derived from toxin of tropical cone
snail, model organisms in medical research.)
A
nimals
maintain ecosystem services (plant
pollination)
A
nimals
adversely affect human health (and economies) (rodents harbor human pathogens.)
Slide5Historical Trends
Paleozoic era
–
explosive adaptive radiation during Cambrian period
Mesozoic era
–
ended with dinosaur extinction
Cenozoic era
–
emergence of homo sapiens
Slide6Review Question #1
Which of the following statements accurately describes typical observed effects of climate change on coral populations, and mechanisms for these
effects.
A. Climate
change has generally caused increases in coral abundance because coral production increases as water temperatures increase.
B. Climate
change has generally caused increases in coral abundance because coral production increases as pH of the water declines.
* C
. Climate
change has generally caused declines in coral abundance because coral production declines as pH of the water declines.
D. Climate
change has generally caused declines in coral abundance because sea levels (nearshore water depth) are declining and coral habitat area is reduced.
Slide7Review Question #2
Which of the following lists of traits accurately describes the correct sequence of events of evolution, beginning with the first (earliest or oldest) trait to emerge, and ending with the most recent trait to emerge?
A. Body
segmentation, diploblast embryo,
triploblast
embryo, multicellularity, specialized cells, cephalization
* B
. Multicellularity
, specialized cells, diploblast embryo,
triploblast
embryo, cephalization, body segmentation
C. Diploblast
embryo, specialized cell,
triploblast
embryo, cephalization, body segmentation, multicellularity
D.
Triploblast
embryo, multicellularity, cephalization, diploblast embryo, body segmentation, specialized cells
Slide8Review Question #3
What is the oldest animal lineage?
* A
.
Porifera
(sponges)
B.
Cnidaria
(jellyfish, corals, sea anemones)
C. Platyhelminthes
(flatworms)
D. Mollusca
(snails, clams, squid)