Why is bilateral symmetry of adaptive value for actively motile animals?

Describe the feeding mechanism of sponges and identify how it is different from other animals.

The rhynchocoel is a. circulatory system fluid-filled cavity primitive excretory system proboscis

Which of the following does not occur? a. radially symmetrical diploblast b. diploblastic eucoelomate c. protostomic coelomate d. bilaterally symmetrical deuterostome

Members of Chondrichthyes differ from members of Osteichthyes by having a _______. a. jaw b. bony skeleton c. cartilaginous skeleton d. two sets of paired fins

Members of Chondrichthyes differ from members of Osteichthyes by having (a). jaw bony skeleton cartilaginous skeleton two sets of paired fins

What can be inferred about the evolution of the cranium and the vertebral column from examining hagfishes and lampreys?

The large central opening in the poriferan body is called the ______. a. emmule b. picule c. stia d. osculum

Which of the following is not a feature common to most animals? a. development into a fixed body plan b. asexual reproduction c. specialized tissues d. heterotrophic nutrient sourcing

How does segmentation enhance annelid locomotion? Segmentation creates repeating body structures so the entire organism functions in synchrony Segmentation allows specialization of different body regions Neural segmentation allows annelids to localize sensations Muscle contractions can be localized to specific regions of the body to coordinate movement.