Changes in Animals and Environments

5. To inhale and exhale
6. Animals that have backbones
10. Animals whose body heat changes with the temperature of their environment
11. The ability to do work. An example is heat energy
12. Animals who keep the same body temperature
15. The grouping of plants or animals by similar features
20. An insect that is changing from a larva to an adult
21. A claw of a bird of prey
25. The things around something
27. Animals such as frogs, toads, and salamanders
28. To become larger and take up more space
29. A scale of temperature
30. To shed, as some animals do in their skin, feathers or fur
33. An instrument that makes small things look large
34. An early stage of an insect's life
37. A tank for living fish
38. The natural surroundings of where a plant or animal lives.
39. The last of the three parts of an insect, the segments of an insect's body behind the thorax

1. A small animal that lives in dead wood
2. Between hot and cold
3. To look, see and learn
4. A design
7. An instrument that measures the temperature of something
8. A scale of temperature
9. A complete change in form that takes place in the life cycle of some animals
13. When a liquid, such as water, turns to vapor
14. An animal who eats dead animals
16. A long feeler on an insect
17. To increase
18. To adjust or become suitable for an environment
19. The middle part of an insect's three-part body
22. Organs used for breathing
23. A measure of heat
24. A tube that carries body fluid, such as blood
26. A very young frog that still lives in water
30. Animals who have hair or fur, give birth to their young and make milk for their young
31. Liquid water
32. A period in metamorphosis
35. A full-grown animal or plant
36. To stay alive