Top 100 presentations

1. Continuous Verb Tenses
   35422
2. Support and transport in plants
   33914
3. Anyong Tubig Anyong Lupa sa Asya
   29377
4. Elements compounds and mixtures
   26077
5. Chromosome
   22115
6. Simple Verb Tenses
   20828
7. Atomic Structure
   20315
8. Balancing Chemical Equations. Balancing redox equations
   20195
9. Periodic Behavior
   19939
10. Newton’s laws of motion
    18924
11. Periodic Trends
    16773
12. Adverbs
    16658
13. Percent Composition, Empirical and Molecular Formulas
    16008
14. Animal Farm
    15833
15. Bonding, Molecular Shape & Structure
    14784
16. Circulation and Gas Exchange
    13513
17. MakingFood
    13441
18. DNA - An overview
    13139
19. Atomic Structure and Periodic Trends
    12940
20. Fungi
    12917
21. Volumetric
    12709
22. Feminism- Cure or Curse
    12573
23. Atomic Structure and Periodicity
    12546
24. Hormones and the Endocrine System
    12221
25. Animal Development
    12160
26. Derivation Applications of Bernoulli Principal
    11938
27. Osmoregulation and Excretion
    11543
28. Plasma Membrane-Gateway to the Cell
    10825
29. Plant Structure, Growth, and Development
    10800
30. Acid, bases and salts
    10338
31. Development
    10262
32. Mirrors and Lenses
    10211
33. Structure of the Atom
    9960
34. Balanced forces
    9943
35. Ancient Civilizations
    9852
36. Mass Spectrometry
    9782
37. Pronouns
    9757
38. Nouns
    9707
39. Resource Acquisition and Transport in Vascular Plants
    9557
40. Forests
    9405
41. Support and transport in plants
    9398
42. Atomic Structure
    9334
43. Cell Types and Cell Structure
    9002
44. Newton’s third law of motion
    8964
45. Animal Nutrition
    8760
46. Transplantation Immunology
    8661
47. Cellular respiration
    8525
48. Growing Plants
    8399
49. Sensory and Motor Mechanisms
    8394
50. Electrical Circuits
    8273
51. Plant Responses to Internal and External Signals
    8259
52. Lab Equipment
    8065
53. Prepositions
    8004
54. Neurons, Synapses, and Signaling
    7944
55. Viruses, Viroids, and Prions
    7915
56. Of Mice and Men
    7857
57. A Tour of the Cell
    7787
58. Basic Structure of a Cell
    7680
59. Real time PCR and it's functions in diagnosis
    7652
60. Covalent Bonding (Molecules)
    7605
61. Plant structure adaptations and responses
    7558
62. Ionic Bonding
    7468
63. Cellular Division
    7463
64. Mendelian Genetics
    7125
65. To Kill a Mockingbird
    7104
66. Satellite Orbits and Uses NIS
    7057
67. Blood Type Genetics
    7049
68. Sound
    6994
69. Molecules and Ions
    6936
70. Well logging The Bore Hole
    6922
71. The Immune System
    6889
72. Membrane Structure and Function
    6824
73. Animal Reproduction
    6769
74. Angiosperm Reproduction and Biotechnology
    6707
75. The Chemistry of Acids and Bases
    6701
76. Plant Diversity
    6634
77. Mendel and the Gene Idea
    6627
78. Rocks
    6625
79. Cell Communication
    6601
80. Balancing Chemical Equations
    6518
81. Rate Laws
    6384
82. Introduction to Oscillations and Simple Harmonic Motion
    6356
83. Drama
    6350
84. Hybridization of Orbitals
    6334
85. The Building Blocks of Matter Atoms
    6279
86. Empirical Formula
    6223
87. An Introduction to Metabolism
    6195
88. Electron Quantum Numbers
    6191
89. Translation. Protein from RNA
    6103
90. Neurons
    6063
91. The Structure and Function of Large Biological Molecules
    6031
92. Photosynthesis
    5954
93. The Mole
    5920
94. Cell Membrane + Tissues & Organs Definitions
    5896
95. Earthquakes
    5856
96. Karyotypes
    5849
97. ADP, ATP and Cellular Respiration
    5818
98. Endocrine System
    5761
99. Classical greek philosophy
    5722
100. Population Ecology
     5696

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