Top 100 presentations

1. Continuous Verb Tenses
   35446
2. Support and transport in plants
   33930
3. Anyong Tubig Anyong Lupa sa Asya
   29391
4. Elements compounds and mixtures
   26097
5. Chromosome
   22142
6. Simple Verb Tenses
   20833
7. Atomic Structure
   20337
8. Balancing Chemical Equations. Balancing redox equations
   20206
9. Periodic Behavior
   19956
10. Newton’s laws of motion
    18941
11. Periodic Trends
    16778
12. Adverbs
    16666
13. Percent Composition, Empirical and Molecular Formulas
    16021
14. Animal Farm
    15848
15. Bonding, Molecular Shape & Structure
    14799
16. Circulation and Gas Exchange
    13548
17. MakingFood
    13459
18. DNA - An overview
    13159
19. Atomic Structure and Periodic Trends
    12963
20. Fungi
    12925
21. Volumetric
    12725
22. Feminism- Cure or Curse
    12580
23. Atomic Structure and Periodicity
    12564
24. Hormones and the Endocrine System
    12261
25. Animal Development
    12182
26. Derivation Applications of Bernoulli Principal
    11949
27. Osmoregulation and Excretion
    11564
28. Plasma Membrane-Gateway to the Cell
    10839
29. Plant Structure, Growth, and Development
    10813
30. Acid, bases and salts
    10363
31. Development
    10280
32. Mirrors and Lenses
    10214
33. Structure of the Atom
    9967
34. Balanced forces
    9961
35. Ancient Civilizations
    9861
36. Mass Spectrometry
    9788
37. Pronouns
    9762
38. Nouns
    9719
39. Resource Acquisition and Transport in Vascular Plants
    9572
40. Forests
    9410
41. Support and transport in plants
    9410
42. Atomic Structure
    9339
43. Cell Types and Cell Structure
    9008
44. Newton’s third law of motion
    8979
45. Animal Nutrition
    8783
46. Transplantation Immunology
    8669
47. Cellular respiration
    8536
48. Sensory and Motor Mechanisms
    8422
49. Growing Plants
    8412
50. Plant Responses to Internal and External Signals
    8292
51. Electrical Circuits
    8285
52. Lab Equipment
    8069
53. Prepositions
    8007
54. Neurons, Synapses, and Signaling
    7963
55. Viruses, Viroids, and Prions
    7923
56. Of Mice and Men
    7872
57. A Tour of the Cell
    7809
58. Basic Structure of a Cell
    7688
59. Real time PCR and it's functions in diagnosis
    7660
60. Covalent Bonding (Molecules)
    7608
61. Plant structure adaptations and responses
    7567
62. Cellular Division
    7480
63. Ionic Bonding
    7473
64. Mendelian Genetics
    7130
65. To Kill a Mockingbird
    7113
66. Satellite Orbits and Uses NIS
    7071
67. Blood Type Genetics
    7057
68. Sound
    7019
69. Molecules and Ions
    6939
70. Well logging The Bore Hole
    6937
71. The Immune System
    6912
72. Membrane Structure and Function
    6846
73. Animal Reproduction
    6781
74. Angiosperm Reproduction and Biotechnology
    6721
75. The Chemistry of Acids and Bases
    6713
76. Plant Diversity
    6646
77. Mendel and the Gene Idea
    6643
78. Rocks
    6632
79. Cell Communication
    6618
80. Balancing Chemical Equations
    6523
81. Rate Laws
    6394
82. Introduction to Oscillations and Simple Harmonic Motion
    6365
83. Drama
    6357
84. Hybridization of Orbitals
    6338
85. The Building Blocks of Matter Atoms
    6287
86. Empirical Formula
    6229
87. An Introduction to Metabolism
    6213
88. Electron Quantum Numbers
    6198
89. Translation. Protein from RNA
    6106
90. Neurons
    6069
91. The Structure and Function of Large Biological Molecules
    6051
92. Photosynthesis
    5972
93. The Mole
    5924
94. Cell Membrane + Tissues & Organs Definitions
    5910
95. Earthquakes
    5863
96. Karyotypes
    5853
97. ADP, ATP and Cellular Respiration
    5821
98. Endocrine System
    5764
99. Classical greek philosophy
    5732
100. Population Ecology
     5713

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