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Across 1. another name for the vacuum flask 5. a substance that is a poor conductor of heat 8. The organ in the lower body of a woman or female mammal where offspring gestates before birth 9. There are two main types of photoreceptors: cones and ________ 11. transfer of heat without a medium 12. lens used to fix far-sightedness 15. the clear, curved layer in front of the iris and pupil. 16. By changing its shape, the _________ focuses light onto the retina 18. at night a person on the seashore enjoys _______breeze

Down 2. sense organ that is stimulated by light 3. where fertilization is most likely to occur 4. transfer of heat by contact 6. the black hole in the middle of the eye 7. The male genital organ of higher vertebrates, carrying the duct for the transfer of sperm during copulation 10. spiral shaped part of the ear that transforms sound into nerve impulses 13. the circular, colored area of the eye that surrounds the pupil—controls the amount of light that enters the eye 14. near-sightedness 17. sense organ that is stimulated by sound