The retention by adults of traits previously seen only in the young is important in
developmental biology, and consequently in evolution. It occurs in two ways. In
Chapter 29: Echinoderms and Invertebrate Chordates. Echinoderms ... 3, An
animal that retains its chordate features throughout life is the _____. Need a Hint
Apr 19, 2012 ... Because sponges are sessile, they get their food through ______. ... An animal
that retains its chordate features throughout life is the _____.
... derived characteristics of chordates distinguish them from their ancestors: ...
these characteristics need not be retained throughout life for an animal to be ...
Animals in the phylum Chordata share four key features: a notochord, a dorsal ...
The notochord provides skeletal support, gives the phylum its name, and
develops ... acts as the primary axial support of the body throughout the animal's
lifetime. ... The Cambrian Explosion of Animal Life, and Characteristics of
The three features unique to chordates and found in all of them at least during
early ... into the head and keeps the animal from telescoping when its muscles
contract. .... Throughout life, hagfish and lamprey retain the notochord, a
... 36: Chemical Coordination, Chapter 37: Immunity, Chapter 38: Animal
Behavior ... For simplicity, however, this text retains the traditional Linnaean
classification, but ... These characteristics are found in all chordates at some
stage of their life ... In the protochordates and jawless vertebrates, it is persistent
Mar 30, 2012 ... Vertebrates retain traces of a feeding apparatus like that of tunicates and
cephalochordates. ... The chordate life cycle begins with fertilization (the union of
sperm and egg). In its primitive form, fertilization occurs externally, in the water. ....
possess gill slits and other features not found in other animal phyl...
Nov 21, 2008 ... The higher chordates were built on the foundation of this model ... defining
characteristics of the phylum Chordata, along with the presence of a hollow ...
Lancelets (suphylum Cephalochordata) retain the notochord throughout their
lives ... the hagfish and lampreys, the notochord remains throughout life and ...
characteristics can only be seen during a relatively small portion of the life cycle
... embryonic or larval stage, when the animal is difficult to observe). ... Then they
travel along the odor gradient until they find their food, whereupon .... 5) Which
class of chordates retains all of the four basic chordate characteristics in the ad...