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The simplest unit in this hierarchy is the atom, like oxygen. Two or more atoms is a molecule, like a dioxide. Many small molecules may combine in a chemical reaction to make up a macromolecule, such as a phospholipid.
In 1839, Theodor Schwann states that along with plants, animals are composed of cells or the product of cells in their structures. [11] This was a major advance in the field of biology since little was known about animal structure up to this point compared to plants.
The site was updated in 2014 to replace the Standard Grade section with National 4 and National 5 sections. Gaelic versions of these were also made available. Until 2014, in the Higher section, Biology, English, Geography, Maths, Chemistry, History, Modern Studies, Physics and the Scotland-only subject Scottish Gaelic were available.
This six-kingdom model is commonly used in recent US high school biology textbooks, but has received criticism for compromising the current scientific consensus. [13] But the division of prokaryotes into two kingdoms remains in use with the recent seven kingdoms scheme of Thomas Cavalier-Smith, although it primarily differs in that Protista is ...
Development of the human body is the process of growth to maturity.The process begins with fertilization, where an egg released from the ovary of a female is penetrated by a sperm cell from a male.
Abiogenesis; Aerobiology; Agronomy; Agrostology; Anatomy; Astrobiology; Bacteriology; Biochemistry; Biogeography; Biogeology; Bioinformatics; Biological engineering
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