Master this deck with 35 terms through effective study methods.
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It helps assign a systematic position to newly described species.
Cells are arranged as loose aggregates with some division of labor.
Tissues are formed from groups of cells performing the same function.
Organs are grouped into systems for specific physiological functions.
Incomplete systems have one opening; complete systems have two.
Open type bathes tissues directly; closed type circulates blood through vessels.
Sponges are mostly asymmetrical.
Body can be divided into identical halves by multiple planes.
Bilateral symmetry allows division into identical halves in only one plane.
They have two embryonic layers: ectoderm and endoderm.
Animals with three germinal layers: ectoderm, mesoderm, and endoderm.
A body cavity lined by mesoderm.
Coelomates have a coelom lined by mesoderm; pseudocoelomates do not.
Animals that lack a body cavity.
Body divided into segments with repeated organs.
A rod-like structure formed during embryonic development in chordates.
They are asymmetrical, primitive multicellular animals with cellular organization.
They reproduce asexually by fragmentation and sexually by gametes.
Aquatic, radially symmetrical animals with a tissue level of organization.
Cells containing stinging capsules used for defense and prey capture.
Polyp (sessile) and medusa (free-swimming).
Alternation of generations between polyp and medusa forms.
They exhibit bioluminescence and have eight ciliated comb plates.
Reproduction occurs only by sexual means with external fertilization.
They are dorso-ventrally flattened and mostly endoparasitic.
Platyhelminthes are bilaterally symmetrical and have acoelomate body structure.
They have a complete alimentary canal and are pseudocoelomate.
Annelida are metamerically segmented and possess a closed circulatory system.
It provides protection and support, allowing for jointed appendages.
Mollusca have a soft body covered by a calcareous shell, while Arthropoda have an exoskeleton.
They possess a water vascular system for locomotion and feeding.
Hemichordata have a stomochord, while Chordata have a true notochord.
Presence of a notochord, dorsal nerve cord, and pharyngeal gill slits.
Urochordata have a notochord only in the larval tail, while Cephalochordata retain it throughout life.
They have a ventral muscular heart and a vertebral column replacing the notochord.