1 Invertebrates have a (an) ____ which provides a support framework.A) exoskeleton B) endoskeleton C) ectoderm D) mesoderm 2 What major structural difference exists between plants and animals?A) Animal cells do not form tissues. B) Animal cells lack cell walls. C) Plants cells lack cell walls. D) Animals do not reproduce sexually. 3 Which of these cells is the gastrula? (31.0K)
A) second image B) third image C) fourth image D) fifth image 4 Which of these is not an endoskeleton material?A) mesoderm B) cartilage C) calcium carbonate D) bone 5 Which of these is not a feature of asexual reproduction?A) offspring genetically identical to parent B) offspring genetically different than parent C) involves budding or fragmentation D) offspring produced by a single parent 6 What structural factors enable animals to move in a variety of ways?A) mouth shape and fur B) cephalization and mouth shape C) symmetry and cephalization D) symmetry and tooth shape 7 Animals that remain stationary and usually require adaptations for feeding are described as ____.A) free floating B) segmented C) heterotrophic D) sessile 8 Which of these is correct regarding arthropods, based on this information? (7.0K)
A) They lack body cavities. B) They have body cavities. C) They are not segmented. D) They have no similarities to annelids. 9 How do pseudocoelomates differ from coelomates?A) There is no true body cavity. B) The body cavity is entirely in the mesoderm. C) The body cavity is between the mesoderm and endoderm. D) There is no fluid in the body cavity. 10 What has recent molecular findings shown regarding relationships between animals?A) closer relation of arthropods and nematodes B) tissues not a factor in animal classification C) embryological development not a factor in animal classification D) arthropods and nematodes show no similarities 11 Which of these represents the correct order of evolutionary branching points, from earliest to most recent?A) radial symmetry, bilateral symmetry, tissue development B) segmentation, body cavity, tissue development C) coelom, tissue development, segmentation D) tissue development, coelom, segmentation 12 A system called the ____ conducts impulses through the bodies of cniderians.A) nematocyst B) gastrovascular cavity C) medusa D) nerve net 13 What phylum does this organism belong to? (28.0K)
A) Porifera B) Cnidaria C) Protista D) Arthropoda 14 What is released from the cells in the cavity depicted here? (18.0K)
A) tentacles B) toxins C) digestive enzymes D) nematocysts 15 These structures are found in the ____ of cniderians. (13.0K)
A) DNA B) gastrovascular cavities C) coeloms D) tentacles