Anatomy is that branch of biology that studies the structures and positioning of parts of an organism and the whole organism. it is interested in just how the structures are and has nothing to do with the functioning.

Approximations in mathematics is simply the idea or concept of taking the closest number to a given real value. For example, 2,100 is approximately 2,000. 

This is sometimes helpful in writing the numbers in a more comprehensive (in the case of whole numbers) or shorter (in the case of decimals) way.

Approximations are done by "rounding off" certain numbers according to precise rules. Rounding off could either be rounding down or rounding up.

This is a condition where a person sees blurry because of poor refraction of light at either the conea or lens or poor curvature at the retina.  

This is the branch of Biology that studies the chemicals and chemical reactions that take place in living organisms.

Biology is the study of living things. Biology originates from two greek words "Bios" which means life and "logos" which means study. Hence, biology can also be etymologically defined as "the study of life". For this reason, biology is interested in everything that possesses the characteristics of living things.

Botany is that branch of Biology that studies plants only.

These are organic molecules made up of carbon hydrogen and oxygen only in the ratio 1:2:1 via the formula (CH2O)n where n must be a whole number greater than or equal to 3.

We can thence conclude that the simplest sugar or carbohydrate is a 3-carbon sugar (triglyceraldehyde).

Sugars can be classified according the number of subunits they have into monosaccharides, disaccharides, oligosaccharides and polysaccharides. They can also be classified according to the type of carbonyl group they carry: aldosugars and ketosugars

Chemistry is the study of the composition, structure, nature and reaction that exist within and between matter. It is therefore a nature science.

Chromosomes are thred-like structure found in the nucleus of cells and are made up of protein and a DNA molecule. Chromosomes are actually DNA molecules that have coiled up to form a denser structure. A chromosome is observed to have two "fingers" called sister chromatids, attached to each other at the centromere.

This is the branch of biology that studies the cell.

It is interested in the origin, life and nature of the cell. It sees the cell as the most basic form of life.

Ecology is the branch of Biology that studies all living organisms in relation to their environment. 

Ecology can thence be seen as the branch of biology that unites the studies made in biology. It also has a direct link with geography.

Endocrinology is that branch of biology that is concerned with the structure, disposition and functioning of endocrine cells and glands. Endocrine glands are those glands that are produce hormones in a living organism. These hormones are poured directly into blood without passing through ducts.

On an etymological percepective, endocrinology will be the science (logy) of endocrine tissues and cells.

Genetics is the study of heredity and variation. It is therefore interested in what is inherited and how it's inherited. It also studies the differences observed between offspring of the same species.

Geography is the study of the earth and it's features, the distribution of life on earth it's relationship with man.

Etymologically, geography can be seen as "geo" for earth and "graphy" for mapping. It is this the study of how life 'shapes' the earth.