An enzyme is a highly selective catalyst that greatly accelerates both the rate and specificity of metabolic reactions. A hormone, on the other hand, is a chemical released by a cell or a gland in one part of the body that sends out messages that affect cells in other parts of the organism.

Egg cells, also known as or ovum or oocyte, are the cells that a part of woman’s reproductive system and are the one of the largest cells in the female body. On the other hand, sperm cells are the complete opposite of egg cells. The sperm is one of the smallest cells in the male body. They are a made up of a small nucleus with a small amount of cytoplasm, some mitochondria and a long tail.

Celsius, also known as centigrade, is a commonly used unit system that is used to measure the temperature. The Kelvin scale was proposed by William Thomson, 1st Baron Kelvin in 1848. He proposed developing an absolute, thermodynamic temperature scale, using its base point as absolute zero.

Aloe is a genus of plants in the Plantae Kingdom that has over 400 species of flowering succulent plants. Aloe Vera is one of the most common species of the Aloe plant, which is believed to originate from northern Africa.

Gophers are mammals that belong to the Sciuridae family. Gopher is an umbrella term that describes a number of species of small borrowing rodents including pocket gopher (also known as true gophers), the ground squirrel, certain species of prairie dog and Richardson's ground squirrel. Moles are also borrowing creatures and belong to Talpidae family. The term ‘mole’ means “{one who throws soil or mud.” Moles are small, round creatures that have short fur, short tail and small eyes and ears (they have very poor eyesight).

The main purpose of the SNS is to activate the response of the body during stressful situations, including the fight-or-flight mechanism of the body. The parasympathetic nervous system is responsible for stimulation of "rest-and-digest" or "feed and breed" activities that occur when the body is at rest.

Steroids are fat-soluble organic compounds that are naturally present and produced in the human body. These are responsible for a wide range of physiological development such as reproductive growth, tissue regeneration, and caloric synthesis in the human body. Antibiotics are antibacterial agents that help kill bacteria and inhibit bacteria growth.

A sequence is an ordered list of numbers or terms. It can contain elements, numbers and terms and can be a limited set or an infinite set. A series on the other hand is the sum of a sequence.

Oceans are large bodies of water that exist on the Earth. An ocean is a body of saline water that composes a large part of a planet's hydrosphere. A gulf is a part of the ocean and is a large area of an ocean of a sea that is enclosed by land partially or on three sides.

Panadol, i.e. paracetamol, is a non-narcotic painkiller which is essentially used to ease mild to moderate pain from headaches, toothache, muscle and joint pains and period pains. It can also be used for relieving the symptoms of allergies, cold, cough, and flu. Aspirin is a non-narcotic inflammatory drug, which can be used to relieve pain and inflammation caused by rheumatic and muscular pain, sprains, backache, headache, sore throat, toothache, and period pain.

Iodine is a chemical element with symbol I and atomic number 53. Iodine gains one electron in order to become an iodide ion (I- ion).

In terms of chemistry and physics, adhesion is the tendency of dissimilar particles or surfaces to cling to one another. Cohesion is the tendency of similar or identical molecules to cling to each other.

In the United Kingdom, GMT is the official time during winter, while BST is the official time during summer. During British Summer Time (BST), the clocks are moved forward during summer and back in the winter.