Top 100 presentations

1. Continuous Verb Tenses
   35463
2. Support and transport in plants
   33943
3. Anyong Tubig Anyong Lupa sa Asya
   29454
4. Elements compounds and mixtures
   26110
5. Chromosome
   22159
6. Simple Verb Tenses
   20841
7. Atomic Structure
   20353
8. Balancing Chemical Equations. Balancing redox equations
   20221
9. Periodic Behavior
   19962
10. Newton’s laws of motion
    18963
11. Periodic Trends
    16781
12. Adverbs
    16671
13. Percent Composition, Empirical and Molecular Formulas
    16025
14. Animal Farm
    15860
15. Bonding, Molecular Shape & Structure
    14808
16. Circulation and Gas Exchange
    13560
17. MakingFood
    13467
18. DNA - An overview
    13190
19. Atomic Structure and Periodic Trends
    12980
20. Fungi
    12936
21. Volumetric
    12738
22. Feminism- Cure or Curse
    12583
23. Atomic Structure and Periodicity
    12572
24. Hormones and the Endocrine System
    12276
25. Animal Development
    12206
26. Derivation Applications of Bernoulli Principal
    11952
27. Osmoregulation and Excretion
    11576
28. Plasma Membrane-Gateway to the Cell
    10847
29. Plant Structure, Growth, and Development
    10827
30. Acid, bases and salts
    10377
31. Development
    10290
32. Mirrors and Lenses
    10226
33. Structure of the Atom
    9977
34. Balanced forces
    9968
35. Ancient Civilizations
    9868
36. Mass Spectrometry
    9789
37. Pronouns
    9768
38. Nouns
    9726
39. Resource Acquisition and Transport in Vascular Plants
    9593
40. Support and transport in plants
    9422
41. Forests
    9415
42. Atomic Structure
    9349
43. Cell Types and Cell Structure
    9013
44. Newton’s third law of motion
    8998
45. Animal Nutrition
    8802
46. Transplantation Immunology
    8678
47. Cellular respiration
    8543
48. Sensory and Motor Mechanisms
    8442
49. Growing Plants
    8422
50. Plant Responses to Internal and External Signals
    8304
51. Electrical Circuits
    8291
52. Lab Equipment
    8080
53. Prepositions
    8012
54. Neurons, Synapses, and Signaling
    7976
55. Viruses, Viroids, and Prions
    7932
56. Of Mice and Men
    7874
57. A Tour of the Cell
    7823
58. Basic Structure of a Cell
    7693
59. Real time PCR and it's functions in diagnosis
    7667
60. Covalent Bonding (Molecules)
    7614
61. Plant structure adaptations and responses
    7570
62. Cellular Division
    7486
63. Ionic Bonding
    7475
64. Mendelian Genetics
    7137
65. To Kill a Mockingbird
    7122
66. Satellite Orbits and Uses NIS
    7079
67. Blood Type Genetics
    7064
68. Sound
    7040
69. Molecules and Ions
    6943
70. Well logging The Bore Hole
    6943
71. The Immune System
    6929
72. Membrane Structure and Function
    6853
73. Animal Reproduction
    6792
74. The Chemistry of Acids and Bases
    6767
75. Angiosperm Reproduction and Biotechnology
    6729
76. Plant Diversity
    6658
77. Mendel and the Gene Idea
    6650
78. Rocks
    6638
79. Cell Communication
    6628
80. Balancing Chemical Equations
    6529
81. Rate Laws
    6400
82. Introduction to Oscillations and Simple Harmonic Motion
    6373
83. Drama
    6360
84. Hybridization of Orbitals
    6345
85. The Building Blocks of Matter Atoms
    6297
86. Empirical Formula
    6231
87. An Introduction to Metabolism
    6228
88. Electron Quantum Numbers
    6203
89. Translation. Protein from RNA
    6107
90. Neurons
    6076
91. The Structure and Function of Large Biological Molecules
    6059
92. Photosynthesis
    6001
93. The Mole
    5928
94. Cell Membrane + Tissues & Organs Definitions
    5915
95. Earthquakes
    5867
96. Karyotypes
    5855
97. ADP, ATP and Cellular Respiration
    5826
98. Endocrine System
    5765
99. Classical greek philosophy
    5740
100. Population Ecology
     5729

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