Top 100 presentations

1. Continuous Verb Tenses
   35317
2. Support and transport in plants
   33797
3. Anyong Tubig Anyong Lupa sa Asya
   29288
4. Elements compounds and mixtures
   25992
5. Chromosome
   21976
6. Simple Verb Tenses
   20788
7. Atomic Structure
   20208
8. Balancing Chemical Equations. Balancing redox equations
   20117
9. Periodic Behavior
   19880
10. Newton’s laws of motion
    18847
11. Periodic Trends
    16744
12. Adverbs
    16635
13. Percent Composition, Empirical and Molecular Formulas
    15970
14. Animal Farm
    15773
15. Bonding, Molecular Shape & Structure
    14719
16. Circulation and Gas Exchange
    13413
17. MakingFood
    13387
18. DNA - An overview
    13043
19. Fungi
    12865
20. Atomic Structure and Periodic Trends
    12822
21. Volumetric
    12654
22. Feminism- Cure or Curse
    12540
23. Atomic Structure and Periodicity
    12492
24. Hormones and the Endocrine System
    12123
25. Animal Development
    12036
26. Derivation Applications of Bernoulli Principal
    11894
27. Osmoregulation and Excretion
    11455
28. Plasma Membrane-Gateway to the Cell
    10779
29. Plant Structure, Growth, and Development
    10701
30. Acid, bases and salts
    10235
31. Development
    10199
32. Mirrors and Lenses
    10126
33. Structure of the Atom
    9924
34. Balanced forces
    9893
35. Ancient Civilizations
    9812
36. Mass Spectrometry
    9753
37. Pronouns
    9729
38. Nouns
    9672
39. Resource Acquisition and Transport in Vascular Plants
    9482
40. Forests
    9373
41. Support and transport in plants
    9338
42. Atomic Structure
    9294
43. Cell Types and Cell Structure
    8985
44. Newton’s third law of motion
    8921
45. Animal Nutrition
    8680
46. Transplantation Immunology
    8623
47. Cellular respiration
    8498
48. Growing Plants
    8349
49. Sensory and Motor Mechanisms
    8315
50. Electrical Circuits
    8241
51. Plant Responses to Internal and External Signals
    8145
52. Lab Equipment
    8027
53. Prepositions
    7975
54. Viruses, Viroids, and Prions
    7876
55. Neurons, Synapses, and Signaling
    7852
56. Of Mice and Men
    7800
57. A Tour of the Cell
    7691
58. Basic Structure of a Cell
    7649
59. Real time PCR and it's functions in diagnosis
    7599
60. Covalent Bonding (Molecules)
    7578
61. Plant structure adaptations and responses
    7534
62. Ionic Bonding
    7443
63. Cellular Division
    7426
64. Mendelian Genetics
    7080
65. To Kill a Mockingbird
    7049
66. Blood Type Genetics
    7015
67. Satellite Orbits and Uses NIS
    7009
68. Molecules and Ions
    6913
69. Well logging The Bore Hole
    6891
70. Sound
    6873
71. The Immune System
    6809
72. Membrane Structure and Function
    6741
73. Animal Reproduction
    6707
74. The Chemistry of Acids and Bases
    6653
75. Angiosperm Reproduction and Biotechnology
    6641
76. Rocks
    6601
77. Plant Diversity
    6572
78. Mendel and the Gene Idea
    6572
79. Cell Communication
    6516
80. Balancing Chemical Equations
    6483
81. Rate Laws
    6354
82. Drama
    6316
83. Hybridization of Orbitals
    6305
84. Introduction to Oscillations and Simple Harmonic Motion
    6300
85. The Building Blocks of Matter Atoms
    6228
86. Empirical Formula
    6210
87. Electron Quantum Numbers
    6160
88. An Introduction to Metabolism
    6120
89. Translation. Protein from RNA
    6083
90. Neurons
    6028
91. The Structure and Function of Large Biological Molecules
    5950
92. The Mole
    5903
93. Photosynthesis
    5889
94. Cell Membrane + Tissues & Organs Definitions
    5869
95. Earthquakes
    5832
96. Karyotypes
    5827
97. ADP, ATP and Cellular Respiration
    5795
98. Endocrine System
    5751
99. Classical greek philosophy
    5682
100. Population Ecology
     5642

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)