Today, the term “post office” usually refers to government postal facilities providing customer service. “General Post Office” is sometimes used for the national headquarters of a postal service, even if the building does not provide customer service.

A place (building, office, shop, or counter) concerned with the business of delivering letters, post or mail and selling stamps, etc. An organisation that delivers letters (for example, Canada Post, Royal Mail, United States Postal Service).

A quark (/kwɔːrk, kwɑːrk/) is a type of elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. Up and down quarks have the lowest masses of all quarks.

Mycoplasma

egg cell

Nerve cells

The world’s largest single celled organism is an aquatic alga called Caulerpa taxifolia. The largest cell in the world is an ostrich’s egg. Before fertilization, the entire interior of the egg consists of a single cell, which weighs up to 5 pounds.

meals. But, scientifically-speaking, the egg is a single cell laid down by the fernale; when fertilized by the single cell or nucleus of the male sperm, it remains a single cell but then has its full complement of chromosomes and genes.

NEURONS

Robert Hooke

…plant cells, the German botanist Hugo von Mohl coined the word protoplasm to designate……

The word “protoplasm” comes from the Greek protos for first, and plasma for thing formed, and was originally used in religious contexts. It was used in 1839 by J. E. Purkinje for the material of the animal embryo.

In the 1660s, Robert Hooke looked through a primitive microscope at a thinly cut piece of cork. He saw a series of walled boxes that reminded him of the tiny rooms, or cellula, occupied by monks. Medical historian Dr. Howard Markel discusses Hooke’s coining of the word “cell.”