hoose which is FALSE among the following statements about the anatomy of annelids. A. Earthworms have mouth, teeth, pharynx, crop, gizzard, intestines, and anus. B. Species of leeches have either jaws and teeth or proboscis as mechanisms for bloodsucking. C. Leeches have anterior and posterior suckers, being the later as used for attachment only. D. The cirri is for sensory, while the parapodia is for respiration and locomotion. E. Leeches have a fixed number of metameres of 33-34   Choose which is FALSE among the following statements about the reproduction of annelids.   A. Fertilization in leeches is internal, while in the oligochaetes is external. B. The seminal receptacles of each earthworm receive the sperm during copulation. C. Clitellum is visible in leeches only during the reproductive period, while absent in the juvenile stage of earthworms. D. Cocoons are produced by the ovaries to house the developing eggs. E. Organisms of the clade Clitellata have no established asexual reproduction.   Choose which is FALSE among the following statements about the physiology of annelids.    A. Earthworms move via peristaltic movement because of their circular and longitudinal muscles working simultaneously. B. Hirudo medicinalis produce hirudin to inhibit the actions of clotting enzymes so blood-letting is possible. C. Respiration in annelids is cutaneous because of the absence of developed respiratory organs. D. Annelids have closed circulatory system, and complete digestive system. E. The two evolutionary body plans that are first observed in the annelids are the presence of true coelom and jointed appendages.

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

Which structure(s) occur ONLY in chordata? (check all of which are true) A. NotochordB. Dorsal hollow nerve cordC. Endostyle

What type of a body plan doescoelenterates, ctenophores andechinoderms have?A. Annelida                                                B. RadialC. Bilateral                                                D. Platyhelminthes

Which of the following is NOT a characteristic of annelids?   A.they have a closed circulatory system B.they reproduce through sexual reproduction C.there are both male and female earthworms D.they are able to sense vibrations in the ground

You are confronted with two worms that, on first glance, appear to be very similar. Upon closer examination, however, you note one difference that allows you to identify one specimen as an earthworm and the other as a roundworm. That key characteristic is: A. The presence of a gastrovascular cavity B. The presence of a body cavity C. The presence of a muscle layer around the digestive tract D. The absence of a specialized gas exchange surface E. None of the characteristics listed above would allow an earthworm to be distinguished from a roundworm

A“negatively phototaxic” amphipod will swim:a.away from parasitic worms.b.towards parasitic worms.c.away from competing amphipods.d.towards light.e.away from light.

Frogs mouth  Explain the functions of the structures that are part of the frog's mouth such as Volmerine teeth, maxillary teeth, glottis, internal nares, tongue, esophagus, and eustachian tube.

Which of the following factors allows plethodontid (lungless) salamanders to survive and thrive using only their body surface for oxygen uptake? A. Their small size B. The fact that they are ectothermic C. Their thin, permeable integument (skin) D. The relatively high solubility of O₂ in air E. All of the above

Which of the following is a difference between Adapoids and Omomyoids?   A. Adapoids had a bony ear tube, while Omomyoids had an ear hole   B. Adapoids had claws, while Omomyoids had nails   C. Adapoids had a postorbital bar, while Omomyoids had a postorbital plate   D. Adapoids were mostly diurnal, while Omomyoids were mostly nocturnal