Top 100 presentations

1. Continuous Verb Tenses
   35366
2. Support and transport in plants
   33852
3. Anyong Tubig Anyong Lupa sa Asya
   29318
4. Elements compounds and mixtures
   26031
5. Chromosome
   22021
6. Simple Verb Tenses
   20798
7. Atomic Structure
   20236
8. Balancing Chemical Equations. Balancing redox equations
   20151
9. Periodic Behavior
   19904
10. Newton’s laws of motion
    18879
11. Periodic Trends
    16754
12. Adverbs
    16646
13. Percent Composition, Empirical and Molecular Formulas
    15983
14. Animal Farm
    15796
15. Bonding, Molecular Shape & Structure
    14742
16. Circulation and Gas Exchange
    13473
17. MakingFood
    13404
18. DNA - An overview
    13085
19. Atomic Structure and Periodic Trends
    12887
20. Fungi
    12883
21. Volumetric
    12675
22. Feminism- Cure or Curse
    12554
23. Atomic Structure and Periodicity
    12513
24. Hormones and the Endocrine System
    12152
25. Animal Development
    12086
26. Derivation Applications of Bernoulli Principal
    11908
27. Osmoregulation and Excretion
    11492
28. Plasma Membrane-Gateway to the Cell
    10791
29. Plant Structure, Growth, and Development
    10757
30. Acid, bases and salts
    10276
31. Development
    10216
32. Mirrors and Lenses
    10172
33. Structure of the Atom
    9938
34. Balanced forces
    9911
35. Ancient Civilizations
    9827
36. Mass Spectrometry
    9764
37. Pronouns
    9737
38. Nouns
    9678
39. Resource Acquisition and Transport in Vascular Plants
    9505
40. Forests
    9392
41. Support and transport in plants
    9354
42. Atomic Structure
    9308
43. Cell Types and Cell Structure
    8988
44. Newton’s third law of motion
    8938
45. Animal Nutrition
    8708
46. Transplantation Immunology
    8636
47. Cellular respiration
    8506
48. Growing Plants
    8366
49. Sensory and Motor Mechanisms
    8345
50. Electrical Circuits
    8256
51. Plant Responses to Internal and External Signals
    8199
52. Lab Equipment
    8036
53. Prepositions
    7991
54. Viruses, Viroids, and Prions
    7893
55. Neurons, Synapses, and Signaling
    7890
56. Of Mice and Men
    7820
57. A Tour of the Cell
    7732
58. Basic Structure of a Cell
    7664
59. Real time PCR and it's functions in diagnosis
    7625
60. Covalent Bonding (Molecules)
    7588
61. Plant structure adaptations and responses
    7546
62. Ionic Bonding
    7454
63. Cellular Division
    7440
64. Mendelian Genetics
    7094
65. To Kill a Mockingbird
    7068
66. Blood Type Genetics
    7028
67. Satellite Orbits and Uses NIS
    7026
68. Molecules and Ions
    6923
69. Sound
    6920
70. Well logging The Bore Hole
    6904
71. The Immune System
    6841
72. Membrane Structure and Function
    6777
73. Animal Reproduction
    6723
74. The Chemistry of Acids and Bases
    6671
75. Angiosperm Reproduction and Biotechnology
    6668
76. Rocks
    6608
77. Mendel and the Gene Idea
    6602
78. Plant Diversity
    6598
79. Cell Communication
    6557
80. Balancing Chemical Equations
    6501
81. Rate Laws
    6363
82. Drama
    6327
83. Introduction to Oscillations and Simple Harmonic Motion
    6318
84. Hybridization of Orbitals
    6317
85. The Building Blocks of Matter Atoms
    6255
86. Empirical Formula
    6213
87. Electron Quantum Numbers
    6174
88. An Introduction to Metabolism
    6153
89. Translation. Protein from RNA
    6090
90. Neurons
    6035
91. The Structure and Function of Large Biological Molecules
    5978
92. Photosynthesis
    5908
93. The Mole
    5907
94. Cell Membrane + Tissues & Organs Definitions
    5879
95. Earthquakes
    5840
96. Karyotypes
    5836
97. ADP, ATP and Cellular Respiration
    5804
98. Endocrine System
    5753
99. Classical greek philosophy
    5699
100. Population Ecology
     5654

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