Ascidians are sac-like marine organisms. their larvae have well-developed brains and dorsal nerve cords. this suggests that ascidians should be classified with the — cnidarians chordates annelids sponges

What major structure can be used to tell apart the embryos of acoelomates pseudocoelomates and coelomates?

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

In an experiment examining the effects tai chi on arthritis pain, callahan (2010) selected a large sample of individuals with doctor-diagnosed arthritis. half of the participants immediately began a tai chi course and the other half (the control group) waited 8 weeks before beginning. at the end of 8 weeks, the individuals who had experienced tai chi had less arthritis pain that those who had not participated in the course.