Top 100 presentations

1. Continuous Verb Tenses
   35367
2. Support and transport in plants
   33854
3. Anyong Tubig Anyong Lupa sa Asya
   29322
4. Elements compounds and mixtures
   26033
5. Chromosome
   22025
6. Simple Verb Tenses
   20799
7. Atomic Structure
   20242
8. Balancing Chemical Equations. Balancing redox equations
   20154
9. Periodic Behavior
   19906
10. Newton’s laws of motion
    18881
11. Periodic Trends
    16754
12. Adverbs
    16646
13. Percent Composition, Empirical and Molecular Formulas
    15985
14. Animal Farm
    15797
15. Bonding, Molecular Shape & Structure
    14743
16. Circulation and Gas Exchange
    13473
17. MakingFood
    13404
18. DNA - An overview
    13087
19. Atomic Structure and Periodic Trends
    12890
20. Fungi
    12884
21. Volumetric
    12675
22. Feminism- Cure or Curse
    12555
23. Atomic Structure and Periodicity
    12513
24. Hormones and the Endocrine System
    12153
25. Animal Development
    12092
26. Derivation Applications of Bernoulli Principal
    11910
27. Osmoregulation and Excretion
    11497
28. Plasma Membrane-Gateway to the Cell
    10797
29. Plant Structure, Growth, and Development
    10760
30. Acid, bases and salts
    10279
31. Development
    10217
32. Mirrors and Lenses
    10174
33. Structure of the Atom
    9939
34. Balanced forces
    9912
35. Ancient Civilizations
    9827
36. Mass Spectrometry
    9764
37. Pronouns
    9737
38. Nouns
    9685
39. Resource Acquisition and Transport in Vascular Plants
    9505
40. Forests
    9392
41. Support and transport in plants
    9357
42. Atomic Structure
    9308
43. Cell Types and Cell Structure
    8990
44. Newton’s third law of motion
    8939
45. Animal Nutrition
    8710
46. Transplantation Immunology
    8639
47. Cellular respiration
    8506
48. Growing Plants
    8366
49. Sensory and Motor Mechanisms
    8349
50. Electrical Circuits
    8256
51. Plant Responses to Internal and External Signals
    8204
52. Lab Equipment
    8039
53. Prepositions
    7991
54. Neurons, Synapses, and Signaling
    7900
55. Viruses, Viroids, and Prions
    7895
56. Of Mice and Men
    7821
57. A Tour of the Cell
    7732
58. Basic Structure of a Cell
    7664
59. Real time PCR and it's functions in diagnosis
    7627
60. Covalent Bonding (Molecules)
    7589
61. Plant structure adaptations and responses
    7546
62. Ionic Bonding
    7454
63. Cellular Division
    7440
64. Mendelian Genetics
    7105
65. To Kill a Mockingbird
    7073
66. Blood Type Genetics
    7030
67. Satellite Orbits and Uses NIS
    7030
68. Molecules and Ions
    6923
69. Sound
    6922
70. Well logging The Bore Hole
    6904
71. The Immune System
    6842
72. Membrane Structure and Function
    6780
73. Animal Reproduction
    6724
74. The Chemistry of Acids and Bases
    6672
75. Angiosperm Reproduction and Biotechnology
    6670
76. Rocks
    6609
77. Mendel and the Gene Idea
    6603
78. Plant Diversity
    6599
79. Cell Communication
    6558
80. Balancing Chemical Equations
    6503
81. Rate Laws
    6365
82. Drama
    6328
83. Hybridization of Orbitals
    6319
84. Introduction to Oscillations and Simple Harmonic Motion
    6318
85. The Building Blocks of Matter Atoms
    6255
86. Empirical Formula
    6214
87. Electron Quantum Numbers
    6175
88. An Introduction to Metabolism
    6156
89. Translation. Protein from RNA
    6091
90. Neurons
    6037
91. The Structure and Function of Large Biological Molecules
    5979
92. Photosynthesis
    5913
93. The Mole
    5908
94. Cell Membrane + Tissues & Organs Definitions
    5880
95. Earthquakes
    5841
96. Karyotypes
    5838
97. ADP, ATP and Cellular Respiration
    5804
98. Endocrine System
    5753
99. Classical greek philosophy
    5701
100. Population Ecology
     5656

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