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The main difference between vertebrates and invertebrates is that invertebrates, like insects and flatworms, do not have a backbone or a spinal column.

Optical fibre= A thin flexible fibre with a glass core through which light signals can be sent with very little loss of strength.

Acid found in apples= Along with acetic acid, apple cider vinegar contains citric, lactic and malic acids .

Average human respiratory rate of a baby at rest is 30 -40 breaths/min.

There are four main types of tissue: muscle, epithelial, connective and nervous. Each is
made of specialized cells that are grouped together according to structure and function.
Every gland is formed by an ingrowth from an epithelial surface.

Dry air contains:
Nitrogen -78.08%
Oxygen – 20.95%
Argon -0.93%
Carbon dioxide -0.033%
Neon -0.0018%
Helium -0.00052%
Methane – 0.0002%
Krypton – 0.00011%
Dinitrogen oxide -O 0.00005%
Hydrogen – 0.00005%
Xenon – 0.0000087%
Ozone – 0.000001%

element used in atomic clocks – Caesium.
element used in the dials of clocks – Radium.
the element which have least electronegativity – Francium.

Element having the name of sun – Helium.

Element having the name of Earth – Tellurium.

Element having the name of an asteroid – palladium.

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