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Across 5. members of the more familiar primate group 9. include gibbons, gorillas, orangutans, & humans 10. have binocular vision 12. cow's four-chambered stomach 13. what a human is classified to be 16. a tail that can act as a fifth hand 17. mammals eat ___ times as much food as a reptile of the same size 18. mom and young exchange materials through the placenta 19. powerful muscle that pulls the bottom of the chest cavity downward 20. all mammals belong to this group

Down 1. lay eggs 2. center of thinking 3. the ability of mammals to regulate their body heat from within 4. primates that look little like typical monkeys 6. animal who carries young in a pouch 7. the gland that mammals are named after 8. two- foot locomotion 11. thumb that enables humans and primates to grasp three- dimensional objects 14. vision that has the ability to merge visual objects 15. help maintain homeostasis 17. first mammals showed up in this time period