Differentiate between:

a. Open circulatory system and closed circulatory system

b. Oviparous and viviparous characteristic

c. Direct development and Indirect development

Provide appropriate technical term in the space provided.

a. Blood-filled cavity in arthropods __________________________.

b. Free-floating form of cnidaria _____________________________.

c. Stinging organ of jelly fishes ______________________________.

d. Lateral appendages in aquatic annelids ___________________.

Match the following:

Sort out the animals on the basis of their symmetry (radial or bilateral) coelenterates, ctenophores, annelids, arthropods, and echinoderms.

There has been an increase in the number of chambers in heart during evolution of vertebrates. Give the names of the class of vertebrates having two, three or four-chambered heart.