31. One of the reasons that primates have been so evolutionaritly successful for the past 55 million years has been due to their ability to adapt to different biological niches. This is in part due to their _____ dentition.  A. bilophodont  B. Endothermic  C. heterodontic  D. homodontic

Members of Chondrichthyes are thought to be descended from fishes that had ________. a. a cartilaginous skeleton b. a bony skeleton c. mucus glands d. slime glands

18) At a high level, animals can be placed into evolutionary groupings based on their pattern of embryonic development. One of these patterns is called deuterostome development, where the opening called the ______ becomes the ______ and the embryonic cells exhibit _______ development. Group of answer choices gastrula, mouth, indeterminate blastopore, anus, indeterminate blastopore, mouth, determinate gastrula, anus, determinate blastopore, mouth, indeterminate

Which of the following is a derived trait of chordates? A. Endoskeleton B. Dorsal nerve cord C. Skull and vertebrae D. Muscular post-anal tail E. None of the above

Fossil insects many times larger than any insects alive today have been dated to the Carboniferous and Permian periods. These fossils are evidence that during these periods a. the climate was much warmer than it is today. b. the oxygen concentration of the atmosphere was significantly higher than it is today. c. the carbon dioxide concentration of the atmosphere was lower than it is today. d. insects had fewer competitors for food than modern insects. e. there were fewer predators on insects than there are today.

20. All primates share the following characteristics except:  A. They all have traits  B. They are endothermic  C. They nurse their young  D. A heterodontic dentidor

Turtles, lizards, and birds belong to one major lineage of amniotes, and_______ belong to another. a. sharks c. mammals b. frogs and toads d. salamanders

18. A ___ is a morphological feature that some highly social strepsirrhine species have, but which Catarrhine species lack.  a. Y-5 Molar  b. Dental comb  c. Heterodontic dentition d. Coccyx

1. The clade that includes the common ancestor to the Chordata clade and all the Chordata lineages within that clade represents a. Monophyletic clade b. Divergent evolution of the group c. Homologous traits. d.All of the above