This organism is an adult tunicate. How can this organism be classified in the Phylum Chordata, given its relatively simple body plan?

In deuterostomes the blastopore becomes the

You collect a deposit feeding worm from the mud at the bottom of an estuary.  In which zone did you collect this organism?

Detritus is

Since 1960, atmospheric carbon dioxide has

Which of the following is found in chondrichthyes and osteichthyes and is responsible for detecting movement and vibration in the surrounding water?

The organism below is

Most animals in the world are

The most complex level in ecology is the

The tissue marked C is