Top 100 presentations

1. Continuous Verb Tenses
   35377
2. Support and transport in plants
   33863
3. Anyong Tubig Anyong Lupa sa Asya
   29331
4. Elements compounds and mixtures
   26046
5. Chromosome
   22047
6. Simple Verb Tenses
   20805
7. Atomic Structure
   20268
8. Balancing Chemical Equations. Balancing redox equations
   20162
9. Periodic Behavior
   19910
10. Newton’s laws of motion
    18890
11. Periodic Trends
    16757
12. Adverbs
    16646
13. Percent Composition, Empirical and Molecular Formulas
    15989
14. Animal Farm
    15805
15. Bonding, Molecular Shape & Structure
    14753
16. Circulation and Gas Exchange
    13484
17. MakingFood
    13415
18. DNA - An overview
    13097
19. Atomic Structure and Periodic Trends
    12905
20. Fungi
    12893
21. Volumetric
    12685
22. Feminism- Cure or Curse
    12563
23. Atomic Structure and Periodicity
    12522
24. Hormones and the Endocrine System
    12168
25. Animal Development
    12108
26. Derivation Applications of Bernoulli Principal
    11916
27. Osmoregulation and Excretion
    11507
28. Plasma Membrane-Gateway to the Cell
    10806
29. Plant Structure, Growth, and Development
    10766
30. Acid, bases and salts
    10293
31. Development
    10224
32. Mirrors and Lenses
    10183
33. Structure of the Atom
    9942
34. Balanced forces
    9924
35. Ancient Civilizations
    9837
36. Mass Spectrometry
    9770
37. Pronouns
    9740
38. Nouns
    9689
39. Resource Acquisition and Transport in Vascular Plants
    9519
40. Forests
    9395
41. Support and transport in plants
    9368
42. Atomic Structure
    9310
43. Cell Types and Cell Structure
    8992
44. Newton’s third law of motion
    8945
45. Animal Nutrition
    8716
46. Transplantation Immunology
    8642
47. Cellular respiration
    8509
48. Growing Plants
    8370
49. Sensory and Motor Mechanisms
    8359
50. Electrical Circuits
    8259
51. Plant Responses to Internal and External Signals
    8213
52. Lab Equipment
    8044
53. Prepositions
    7994
54. Neurons, Synapses, and Signaling
    7907
55. Viruses, Viroids, and Prions
    7898
56. Of Mice and Men
    7831
57. A Tour of the Cell
    7744
58. Basic Structure of a Cell
    7671
59. Real time PCR and it's functions in diagnosis
    7635
60. Covalent Bonding (Molecules)
    7592
61. Plant structure adaptations and responses
    7548
62. Ionic Bonding
    7457
63. Cellular Division
    7447
64. Mendelian Genetics
    7108
65. To Kill a Mockingbird
    7076
66. Satellite Orbits and Uses NIS
    7038
67. Blood Type Genetics
    7034
68. Sound
    6936
69. Molecules and Ions
    6926
70. Well logging The Bore Hole
    6906
71. The Immune System
    6859
72. Membrane Structure and Function
    6784
73. Animal Reproduction
    6735
74. The Chemistry of Acids and Bases
    6678
75. Angiosperm Reproduction and Biotechnology
    6672
76. Rocks
    6611
77. Plant Diversity
    6611
78. Mendel and the Gene Idea
    6608
79. Cell Communication
    6565
80. Balancing Chemical Equations
    6508
81. Rate Laws
    6369
82. Drama
    6329
83. Introduction to Oscillations and Simple Harmonic Motion
    6329
84. Hybridization of Orbitals
    6325
85. The Building Blocks of Matter Atoms
    6262
86. Empirical Formula
    6217
87. Electron Quantum Numbers
    6178
88. An Introduction to Metabolism
    6163
89. Translation. Protein from RNA
    6094
90. Neurons
    6041
91. The Structure and Function of Large Biological Molecules
    5989
92. Photosynthesis
    5922
93. The Mole
    5911
94. Cell Membrane + Tissues & Organs Definitions
    5885
95. Earthquakes
    5845
96. Karyotypes
    5841
97. ADP, ATP and Cellular Respiration
    5806
98. Endocrine System
    5755
99. Classical greek philosophy
    5705
100. Population Ecology
     5662

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