Top 100 presentations

1. Continuous Verb Tenses
   35217
2. Support and transport in plants
   33709
3. Anyong Tubig Anyong Lupa sa Asya
   29241
4. Elements compounds and mixtures
   25915
5. Chromosome
   21866
6. Simple Verb Tenses
   20752
7. Balancing Chemical Equations. Balancing redox equations
   20045
8. Atomic Structure
   20036
9. Periodic Behavior
   19840
10. Newton’s laws of motion
    18768
11. Periodic Trends
    16708
12. Adverbs
    16618
13. Percent Composition, Empirical and Molecular Formulas
    15941
14. Animal Farm
    15719
15. Bonding, Molecular Shape & Structure
    14663
16. MakingFood
    13336
17. Circulation and Gas Exchange
    13327
18. DNA - An overview
    12961
19. Fungi
    12817
20. Atomic Structure and Periodic Trends
    12758
21. Volumetric
    12609
22. Feminism- Cure or Curse
    12517
23. Atomic Structure and Periodicity
    12425
24. Hormones and the Endocrine System
    12046
25. Animal Development
    11925
26. Derivation Applications of Bernoulli Principal
    11829
27. Osmoregulation and Excretion
    11357
28. Plasma Membrane-Gateway to the Cell
    10725
29. Plant Structure, Growth, and Development
    10604
30. Acid, bases and salts
    10160
31. Development
    10140
32. Mirrors and Lenses
    10058
33. Structure of the Atom
    9894
34. Balanced forces
    9853
35. Ancient Civilizations
    9767
36. Mass Spectrometry
    9719
37. Pronouns
    9708
38. Nouns
    9639
39. Resource Acquisition and Transport in Vascular Plants
    9399
40. Forests
    9344
41. Support and transport in plants
    9284
42. Atomic Structure
    9257
43. Cell Types and Cell Structure
    8961
44. Newton’s third law of motion
    8876
45. Animal Nutrition
    8622
46. Transplantation Immunology
    8551
47. Cellular respiration
    8466
48. Growing Plants
    8296
49. Sensory and Motor Mechanisms
    8250
50. Electrical Circuits
    8205
51. Plant Responses to Internal and External Signals
    8032
52. Lab Equipment
    7984
53. Prepositions
    7946
54. Viruses, Viroids, and Prions
    7844
55. Neurons, Synapses, and Signaling
    7806
56. Of Mice and Men
    7759
57. Basic Structure of a Cell
    7609
58. A Tour of the Cell
    7607
59. Real time PCR and it's functions in diagnosis
    7557
60. Covalent Bonding (Molecules)
    7545
61. Plant structure adaptations and responses
    7519
62. Ionic Bonding
    7422
63. Cellular Division
    7375
64. Mendelian Genetics
    7018
65. To Kill a Mockingbird
    7016
66. Blood Type Genetics
    6975
67. Satellite Orbits and Uses NIS
    6960
68. Molecules and Ions
    6883
69. Well logging The Bore Hole
    6856
70. The Immune System
    6764
71. Sound
    6758
72. Membrane Structure and Function
    6656
73. Animal Reproduction
    6641
74. The Chemistry of Acids and Bases
    6594
75. Rocks
    6575
76. Angiosperm Reproduction and Biotechnology
    6575
77. Plant Diversity
    6527
78. Mendel and the Gene Idea
    6461
79. Balancing Chemical Equations
    6448
80. Cell Communication
    6443
81. Rate Laws
    6329
82. Drama
    6294
83. Hybridization of Orbitals
    6271
84. Introduction to Oscillations and Simple Harmonic Motion
    6252
85. The Building Blocks of Matter Atoms
    6199
86. Empirical Formula
    6186
87. Electron Quantum Numbers
    6126
88. Translation. Protein from RNA
    6069
89. An Introduction to Metabolism
    6060
90. Neurons
    5997
91. The Structure and Function of Large Biological Molecules
    5887
92. The Mole
    5880
93. Cell Membrane + Tissues & Organs Definitions
    5839
94. Photosynthesis
    5816
95. Karyotypes
    5812
96. Earthquakes
    5803
97. ADP, ATP and Cellular Respiration
    5776
98. Endocrine System
    5738
99. Classical greek philosophy
    5625
100. Conjunction
     5594

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