Give the characteristics of Phylum-Platyhelminthes (Flatworms).

(N/A) The characteristics of Phylum-Platyhelminthes are as follows:
$1$. Body Shape: They have a dorso-ventrally flattened body,hence they are called flatworms.
$2$. Symmetry and Germ Layers: They are bilaterally symmetrical,triploblastic,and acoelomate animals.
$3$. Organ System: They exhibit organ-system level of organization.
$4$. Hooks and Suckers: Parasitic forms possess hooks and suckers for attachment to the host.
$5$. Excretion: Specialized cells called flame cells help in osmoregulation and excretion.
$6$. Reproduction: They are hermaphrodites (bisexual). Fertilization is internal,and development is through many larval stages.
$7$. Regeneration: Some members like Planaria possess high regeneration capacity.