It is an organ system that is composed of the brain, spinal cord, nerves, ganglia, and receptors. This system is responsible for creating, sending signals throughout the body and processing them, and sending the response as signals to the effective organ.

Transpiration is the loss of water from a plant in the form of water vapor. Water is absorbed by roots from the soil and transported as a liquid to the leaves via xylem. In the leaves, small pores allow water to escape as a vapor and CO2 to enter the leaf for photosynthesis.

Ribosomes are the important cell organelles that are involved in protein synthesis. Proteins are required for the proper functioning of the cell. Ribosomes have RNA and proteins which help in converting genetic code into proteins.

Charles Darwin was a British naturalist who proposed the theory of biological evolution by natural selection.

A multicellular/unicellular eukaryotic organism that obtains its food by absorbing nutrients from the environment belongs to the kingdom Fungi.

Hemoglobin (Heme + Globin) The protein hemoglobin is a molecule which is responsible for carrying almost all of the oxygen in the blood. It is composed of four subunits, each with a heme group plus a globin chain.

Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.

A mitochondrion is a round to oval-shaped organelle found in the cells of almost all eukaryotic organisms. It produces energy, known as ATP, for the cell through a series of chemical reactions.

Red cells contain a special protein called hemoglobin, which helps carry oxygen from the lungs to the rest of the body and then returns carbon dioxide from the body to the lungs so it can be exhaled.

The opposite of sublimation is "deposition", where water vapor changes directly into ice—such a snowflakes and frost. It is not easy to actually see sublimation occurring, at least not with ice. One way to see the results of sublimation is to hang a wet shirt outside on a below-freezing day.

Sir Isaac Newton was born especially tiny but grew into a massive intellect and still looms large, thanks to his findings on gravity, light, motion, mathematics, and more.

Gold's chemical symbol AU is derived from the Latin word aurum, meaning gold. Some claim that the word aurum also means shining dawn due to its etymological ties to the word aurora, meaning dawn. The word gold comes from the old English word for yellow, geolu, which was derived from the Germanic word gulþa.

Gamma Rays- Gamma Rays-have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. These waves are generated by radioactive atoms and in nuclear explosions. Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancer cells

They are caused by the gravitational forces exerted on the earth by the moon, and to a lesser extent, the sun. When the highest point in the wave, or the crest, reaches a coast, the coast experiences a high tide. When the lowest point, or the trough, reaches a coast, the coast experiences a low tide.

Mars is sometimes called the Red Planet. It's red because of rusty iron in the ground. Like Earth, Mars has seasons, polar ice caps, volcanoes, canyons, and weather.

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Atoms are the smallest units of matter that have all the characteristics of an element. Atoms combine to form molecules. Atoms are composed of smaller particles known as protons, neutrons, and electrons.

Chlorophyll is responsible for the green color of many plants and algae. Seen through a microscope, chlorophyll is concentrated within organisms in structures called chloroplasts – shown here grouped inside plant cells.

The presidency of Nelson Mandela began on 10 May 1994, when Nelson Mandela, an anti-apartheid activist, leader of uMkhonto we Sizwe, lawyer, and former political prisoner, was inaugurated as President of South Africa, and ended on 14 June 1999.

The Russian Revolution of 1917 was a series of political events in Russia, involving first the overthrow of the system of autocracy, and then the overthrow of the liberal Provisional Government ( Duma), resulting in the establishment of the Soviet power under the control of the Bolshevik party.

Magna Carta was issued in June 1215 and was the first document to put into writing the principle that the king and his government was not above the law. It sought to prevent the king from exploiting his power, and placed limits of royal authority by establishing law as a power in itself.

Settling this financial problem eventually led to the First Opium War between Great Britain and China, from 1839 to 1842.

In January 1776, Thomas Paine (1737–1809) penned his famous pamphlet Common Sense, in which he urged the American Colonies to declare independence and immediately sever all ties with the British monarchy.

While queen of Egypt (51–30 BCE), Cleopatra actively influenced Roman politics at a crucial period and was especially known for her relationships with Julius Caesar and Mark Antony

The Renaissance started in Florence, Italy, a place with a rich cultural history where wealthy citizens could afford to support budding artists. Members of the powerful Medici family, which ruled Florence for more than 60 years, were famous backers of the movement.

Despite its long history, the Great Wall of China as it is exists today was constructed mainly during the mighty Ming Dynasty (1368-1644). Like the Mongols, the early Ming rulers had little interest in building border fortifications, and wall building was limited before the late 15th century.

The American revolutionary war is also known as the “U.S War of Independence”, which started in 1775 and ended in 1783 with the nativity of the U.S.A. Answer.

Erected around 2560 B.C.E. on the west bank of the Nile River, the Great Pyramid served as the tomb of the fourth-century pharaoh Khufu