biology

6. small group of species diversity into many distinct forms
9. middle layer of cells in the gastrula develops into the muscles
10. inner layer of cells in the gastra develops into the digestive system
12. fertilized egg
13. unrelated organisms will evolve to look similar due to similar environmental demands
18. newly adapted characteristic used to separate species
20. long periods of genetic equilibrium interrupted by long periods of rapid change
24. master control genes that determine placement of limbs
25. outer layer of cells in the gastrula
27. section of the evolutionary tree that shows derived character
28. collection of fossilized remains that shows changes in organisms

1. pattern of evolution when a species is no longer present on earth
2. stage of the developing embryo classified as a hollow ball of cells
3. 2 part scientific naming system used to identify organisms
4. study of the early stages of development in a zygote
5. scientific classification that organizes living things into related categories
7. when 2 species that closely interact evolve in response
8. organisms grouped together because the gastrula of the developing embryo
11. those organisms best suited to their environment survive and reproduce
14. unused structures or organs in an organism
15. stage of the developing embryo classified as a hollow ball of cells folded in on itself
16. theory that explains how the first eukaryotic cells came from a symbiotic relationship
17. different structures of an organism are used for similar functions
19. develops into 3 germ layers called the endoderm mesoderm ectoderm
21. small scale change in allele frequencies in a population
22. organisms grouped together because the gastrula developing the embryo
23. some structures of different species are used in different ways
26. random neutral mutations accumulate in the genome of a species