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tama401
wrote...
6 years ago
 Which characteristic distinguishes echinoderms from the other two deuterostome lineages?
   
   Their ability to move
   Their habitat
   Their body plan
   The presence of an endoskeleton

 Which of the following statements about vertebrates is true?
   
   The development of an amniotic egg and internal fertilization allowed vertebrates to reproduce away from water.
   All vertebrates have jaws with which to catch their prey.
   Birds are more related to mammals than to dinosaurs.
   The development of more efficient surfaces for gas exchange in reptiles stimulated expansion into terrestrial habitats.

 Which characteristics define a chordate?
   
   The presence of four specific morphological traits
   The development of an anus from the blastopore
   The ability to live on land
   The presence of a well-developed circulatory system

 Which structure can be used for feeding and gas exchange?
   
   Dorsal nerve cord
   Pharyngeal gill slit
   Endoskeleton
   Notochord
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1 Reply
wrote...
Staff Member
6 years ago
Which characteristic distinguishes echinoderms from the other two deuterostome lineages?
   
   Their ability to move
   Their habitat
   Rightwards Arrow Their body plan
   The presence of an endoskeleton

 Which of the following statements about vertebrates is true?
   
   The development of an amniotic egg and internal fertilization allowed vertebrates to reproduce away from water.
   All vertebrates have jaws with which to catch their prey.
   Birds are more related to mammals than to dinosaurs.

   The development of more efficient surfaces for gas exchange in reptiles stimulated expansion into terrestrial habitats.

 Which characteristics define a chordate?
   
   The presence of four specific morphological traits
   The development of an anus from the blastopore
   The ability to live on land
   The presence of a well-developed circulatory system

Chordates form a phylum of creatures that are based on a bilateral body plan, and is defined by having at some stage in their lives all of the following:

Rightwards Arrow A notochord, in other words a fairly stiff rod of cartilage that extends along the inside of the body. Among the vertebrate sub-group of chordates the notochord develops into the spine, and in wholly aquatic species this helps the animal to swim by flexing its tail.
Rightwards Arrow A dorsal neural tube. In fish and other vertebrates this develops into the spinal cord, the main communications trunk of the nervous system.
Rightwards Arrow Pharyngeal slits. The pharynx is the part of the throat immediately behind the mouth. In fish the slits are modified to form gills, but in some other chordates they are part of a filter-feeding system that extracts particles of food from the water in which the animals live.
Rightwards Arrow A muscular tail that extends backwards behind the anus.
Rightwards Arrow An endostyle. This is a groove in the ventral wall of the pharynx. In filter-feeding species it produces mucus to gather food particles, which helps in transporting food to the esophagus. It also stores iodine, and may be a precursor of the vertebrate thyroid gland.

 Which structure can be used for feeding and gas exchange?
   
   Dorsal nerve cord
   Rightwards Arrow Pharyngeal gill slit
   Endoskeleton
   Notochord
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