3. Man takes advantage of them to produce new 4. More organisms are born than survive. 5. The result is a ceaseless struggle for food and 6. Natural selection tends to maintain the balance FIG. 13. FOSSIL PLANTS FROM, COAL BEDS 14. BELEMNITES . 15. FOSSIL SEA-LIZARD: PLESIOSAURUS 16. FOSSIL FLYING LIZARD: PTERODACTYLUS 17. FOSSIL BIRD: ARCHAEOPTERYX 18. AMMONITE 19. FOSSIL BONY FISH: PERCH AND SALMON 20. NUMMULITES FROM THE GREAT PYRAMID 21. FEET OF ANCESTORS OF THE HORSE 22. STONE IMPLEMENTS: ANCIENT STONE AGE 23. MAMMOTH OR WOOLLY-HAIRED ELEPHANT 24. PREHISTORIC PICTURES. 25. STONE IMPLEMENTS: NEWER STONE AGE. 26. VENUS'S FLY-TRAP 33. FERTILISATION OF FLOWER BY INSECT 34. TRANSITION FROM STAMENS TO PETALS IN WHITE LILY |