How many classes are in Phylum Platyhelminthes?

“Cephalization” refers to having sensory organs in the

In class Turbellaria, these animals have endodermal germ tissues that gives rise to the

The pH of human blood is

What anatomical structure(s) and physiology allow Nematodes to have a wide range of movement and the ability to “hold on?”

Blood flukes of the genus __________ are important human parasites.

Turbellarians feed on rotifers, which are

The most highly specialized class of parasites within phylum Platyhelminthes is

It is estimated that there are ________________ species of sea sponges.

The Oligochaeta worms have