Saliha Rais
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Karachi, Pakistan
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sneeze
diaphragm
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mouth
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pharynx
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nasal cavity
respiratory system
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polar covalent bond
triple covalent
non polar covalent bond
electrovalent bond.
double covalent
characteristics of ionic compounds
single covalent bond
types of covalent bond
characteristics of covalent compounds
ionic character in covalent bonds
bonds
bonding
ionic bond
chemical bond
covalent bond
electron affinity
properties of periodic table
periodicity
electronegativity.
atomic radii
ionization energy
class ix chemistry
law of reciprocal proportions
law of indestructibility of matter
class 9
law of conservation of mass
laws of chemical combinations
law of constant composition
chemical combinations
law of definite proportion
difference between inhalation and exhalation
parts of respiratory system
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exhalation
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air flow path
hiccup.
epiglottis
functions of respiratory system
class 5
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examples of lever
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soft hard and heavy water
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abdul qadeer khan
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famous scientists
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cell organelles
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branches of science
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heavy water
hygroscopic substances.
methods to remove temporary hardness
permanent hardness of water
temporary hardness of water
methods to remove permanent hardness
hardness in water
soft water
hard water
movement magnifiers.
simple machines
force magnifiers
levers
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