The animal kingdom：练习题

What is the primary function of the lateral line system, a key external feature found on most bony fish?

Marine mammals (Cetaceans, Pinnipeds, Sirenians) are vertebrates. How do they typically differ from most marine bony fish in their reproductive method?

Which of the following combinations of features correctly describes the phylum Echinodermata, distinguishing them from Molluscs?

Which combination of characteristic features is used to place marine invertebrates into the group Crustaceans (e.g., crabs, shrimp)?

Which characteristic feature is specific to marine organisms classified as Annelids (e.g., lugworms) that differentiates them from Molluscs?

Name a distinguishing characteristic of crustaceans among marine invertebrates.

State the characteristic body covering of marine birds and explain how their method of fertilization differs from that of most bony fish.

Compare the body segmentation and symmetry of organisms in the phylum Annelida with those in the phylum Mollusca.

Marine invertebrates are classified into various groups based on their physical features.
(a) Identify two characteristic features of the phylum Annelida.
(b) Identify two characteristic features of the phylum Mollusca that distinguish them from annelids.

Bony fish have evolved various external features to survive in the marine environment.
(a) State the function of the lateral line and the operculum.
(b) A fish uses its fins for stability and movement. Identify which fins are primarily responsible for preventing rolling and which fin provides forward thrust.
(c) Explain how scales benefit a bony fish.