BIOLOGY VOL. II
16th Edition
ISBN: 9781308795317
Author: Raven
Publisher: Mcgraw-Hill/Create
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Chapter 34, Problem 4S
Summary Introduction
To explain:
The reason that the lack of
Introduction:
Platyhelminthes such as
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Compare the whole specimens and cross-sections of Ascaris and Dugesia. How would you differentiate these worms? Also, nematodes have a complete gut whereas most platyhelminths have an incomplete one. Think of one advantage of having a complete gut.
The phylum Platyhelminthes has what type of symmetry?
Nematode worms and annelid worms share which of the following features?
presence of a circulatory system
molting
absence of species with parasitic lifestyles
presence of segmentation
a digestive tract with two openings (a mouth and an anus)
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- Describe the two anatomical features of roundworms that are not found in simpler organisms.arrow_forwardWhich of the following classes includes the only type of echinoderm that has a calyx on a stalk? Echinoidea Holothuroidea Ophiuroidea Asteroidea Crinoideaarrow_forwardHow do terrestrial arthropods of the subphylum Hexapoda impact the world’s food supply? Provide at least two positive and two negative effects.arrow_forward
- Which group of flatworms are primarily external parasites of fish? a. monogeneans b. trematodes c. cestodes d. turbellariansarrow_forwardMembers of Chondrichfhyes are thought to be descended from fishes that had. a cartilaginous skeleton a bony skeleton mucus glands slime glandsarrow_forwardWhich of the following is not a member of the phylum Chordata? a. Cephalochordata b. Echinodermata c. Urochordata d. Vertebrataarrow_forward
- What structure differentiates Ectoprocts and Brachiopods from other Lophotrochozoa? Select one: 1-Complete digestive tract with two openings. 2- Fluid-filled coelom. 3- Triploblastic. 4- Suspension feeding via lophophore. 5- Trochophore larval stage. Please provide explanations in detail for the correct option as well as the incorrect options.arrow_forwardRelative to asconoid organization in sponges the syconoid form exhibits smaller body size increased spongocel volume relative to pumping surface area reduced spongocel volume relative to pumping surface area larger body sizearrow_forwardDefine adaptation. How could you use a comparative approach to test whether mesoglea within a scyphozoan medusa was an adaptation for buoyancy? How could you use a different criterion to test whether the eyes of cubozoans were adaptive? Where would a comparative approach prove a better way to assess the adaptive values of a tegument in internal parasites: in tapeworms or nematodes? Why?arrow_forward
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