Biology Questions and Answers
- What is the type of
digestive system of
echinoderms?
Echinoderms pdigestive system, with mresent a comouth and anus.plete
- Do sea urchins have teeth?
Sea urchins have a teeth-like structurejuxtaposed to the mouth and made of
five teeth connected to ossicles and
muscle fibers. This structurAristotle’s lantern, is use to scratche, known as
food, mainly algae, from marine rocks.
- What is the embryonic
characteristic that
evolutionarily makes
echinoderms proximal to
chordates?
Echinoderms adeuterostomes, i.nd chordates are., in their embryonice (^)
development the blastopore turns into
the anus. All other animals withcomplete digestive system are
protostomes, i.e., their blastopore
originates the mouth.
The blastoporthe digestive tue is the first opbe that appears in ening ofthe (^)
embryonic development.
- Do echinoderms have
respiratory and circulatory
systems?
In echinoderms there are not well-
defined respiratory (with thof the holothurian group) ande exception
circulatory systems. The ambulacral
hydrovascular system plays thof these systems. e function- Do echinoderms have an
excretory system? How is
excretion done in these
animals?
Echinoderms dsystem. Their excretions aro not have an excretorye eliminated (^)
by diffusion.
- How are the symmetry and
the nervous system
characterized in echinoderms?
Adult echinoderms, aloncnidarians, are the animalsg with that present (^)
radial symmetry,structures are distributed i.e., their bodyaround a (^)
center. Techinoderms hhe radial symmetry iowever is a secondaryn (^)
radial symmetry, since their larval stage
has bilateral symmetry anpattern appears only in adult individualsd the radial (^)
(there are some few adult echinoderms
with lateral animals have lateral symmetry withsymmetry). All other (^)
exception of poriferans (no symmetry is
defined for them).
Echinoderms do not present
cephalization anetwork of nerves and neurons madnd they have a diffusee of (^)
a neural ring around the mouth and of
radial nerves that ramify to pentaradial structure of the body.follow the
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