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Across 1. animal who carries young in a pouch 3. thumb that enables humans and primates to grasp three- dimensional objects 4. vision that has the ability to merge visual objects 6. lay eggs 9. center of thinking 12. the ability of mammals to regulate their body heat from within 15. a tail that can act as a fifth hand 17. include gibbons, gorillas, orangutans, & humans 18. mom and young exchange materials through the placenta 19. cow's four-chambered stomach 20. all mammals belong to this group

Down 2. primates that look little like typical monkeys 4. two- foot locomotion 5. members of the more familiar primate group 7. what a human is classified to be 8. have binocular vision 10. mammals eat ___ times as much food as a reptile of the same size 11. powerful muscle that pulls the bottom of the chest cavity downward 13. first mammals showed up in this time period 14. the gland that mammals are named after 16. help maintain homeostasis