Terms : Hide Images
| 2397759782 | defining characteristics of animals | multicellular eukaryotes, heterotrophic, lack cell walls, nervous and muscle tissue, sexual reproduction, distinct life stages, Hox genes, similar embryonic development | 0 | |
| 2397764324 | collagen | holds bodies together. extracellular; outside the cell membrane. replacement of cell walls | 1 | |
| 2397766729 | gametic lifecycle | small, motile sperm fertilizes nonmotile egg | 2 | |
| 2397769029 | larva stage | sexually immature | 3 | |
| 2397769030 | metamorphosis | transformation from larva form to adult form | 4 | |
| 2397770429 | Hox genes | unique to animals; regulate expression of other genes | 5 | |
| 2397771492 | homoeboxes | common DNA sequences of Hox genes | 6 | |
| 2397773194 | cleavage | series of mitotic divisions without cell growth between cycles | 7 | |
| 2397774794 | blastula | hollow ball of cells | 8 | |
| 2397774795 | gastrula | layers of embryonic tissue | 9 | |
| 2397780385 | diploblastic | animals with two germ layers (cnidaria-jellyfish) | 10 | |
| 2397781931 | triploblastic | animals with three germ layers (annelida-earthworms) | 11 | |
| 2397783393 | mesoderm | between endoderm and ectoderm | 12 | |
| 2397787799 | ectoderm | outside layer | 13 | |
| 2397787800 | blastocoel | the hollow space in the blastula | 14 | |
| 2397791335 | archenteron | usually becomes digestive system | 15 | |
| 2397791336 | blastospore | opening in blastula, usually becomes mouth/anus | 16 | |
| 2397792692 | endoderm | inner part of blastula | 17 | |
| 2397794535 | asymmetrical | lack symmetry (porifera) | 18 | |
| 2397796450 | radial symmetry | radia-top and bottom; cnidaria and cnetophoria-oral and aboral | 19 | |
| 2397799289 | bilateral symmetry | (remaining phyla) dorsal, ventral, anterior, posterior, left and right | 20 | |
| 2397801568 | dorsal | top | 21 | |
| 2397801569 | ventral | bottom | 22 | |
| 2397802556 | anterior | head | 23 | |
| 2397802557 | posterior | end | 24 | |
| 2397804140 | cephalization | associated with movement; concentration of sensory organs at the anterior end | 25 | |
| 2397805405 | determinant | pre-programmed cells for cellular fixation | 26 | |
| 2397808526 | coelem | body cavity, a fluid or air-filed space located between digestive tract and outer body wall | 27 | |
| 2397819385 | acoelomate | lack fluid-filled cavity between digestive track and outer wall | 28 | |
| 2397820341 | pseudocoelomate | fluid-filled cavity only partially lined by mesoderm | 29 | |
| 2397821778 | coelomates | fluid-filled cavity completely lined with mesoderm | 30 | |
| 2397822801 | advantages of coelem | cushions organs, functions as hydrostatic skeleton, allows internal organs/muscles to be independent of outerwall | 31 | |
| 2397826256 | protostome development | determinant: spiral cleavage, mesoderm grow around archentron, blastospore forms the mouth | 32 | |
| 2397831972 | deuterostome development | indeterminant: radial cleavage, mesoderm grows down, around, and back up, blastospore forms the anus | 33 | |
| 2397840249 | main clades | metazoa, eumetazoa, bilateria, deuterostomia, lophotrochozoa, ecdysozoa | 34 | |
| 2397844957 | metazoa | porifera | 35 | |
| 2397844958 | eumetazoa | cnetophora | 36 | |
| 2397846186 | bilateria | acoela | 37 | |
| 2397848731 | lophotrochozoa | playhelminthes, rotifera, ectoprocta, brachiopoda, mollusca, annelida | 38 | |
| 2397863193 | lophophore | used for feeding | 39 | |
| 2397866346 | characteristics of ecdysozoa | molecular similarities first; morphological/developmental characters second | 40 | |
| 2397870780 | neoproterozoic era | 1b-542 mya; first macroscopic fossils (565-560 mya), named the ediacaran biota for the site of initial discovery | 41 | |
| 2397878325 | paleozoic era | 542-251 mya; had the cambrian explosion | 42 | |
| 2397880408 | cambrian explosion | 535-525 mya; wave of animal diversification. associated with decline of ediacaranbiota | 43 |
