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Respiration
Organization of the Respiratory System Each lung is composed of air sacs called alveoli - the sites of gas exchange with... Read More
Rough endoplasmic reticulum
Rough Endoplasmic Reticulum Definition The rough endoplasmic reticulum (rough ER or rER) is a membrane-bound organelle... Read More
Demographic transition
The demographic transition model is a theoretical framework that explains the historical shift in population dynamics as a... Read More
Saline solution
Saline Solution Definition Saline solution is one the most medically-used solution, which contains sodium chloride... Read More
Trinucleotide repeat disorder
Definition noun, plural: trinucleotide repeat disorders Any of a set of genetic disorders caused by trinucleotide repeats... Read More
Crossbreeding
Definition noun The act or process of producing offspring by mating purebred individuals of different breeds or... Read More
Secondary cell wall
Definition noun plural: secondary cell walls ˈsɛkənˌdɛɹi sɛl wɔːl The layer of the plant cell wall that forms... Read More
Biodiversity
The biological world or life on earth is a marvel that has amazed us since time immemorial. The rich natural diversity of... Read More
Triple response
Definition noun (immunology) The three cardinal circulatory responses of the skin (i.e. reddening, flare formation or... Read More
Thermometer
thermometer (Science: physics) An instrument for measuring temperature, founded on the principle that changes of temperature... Read More
Cytokinesis
The cell cycle of eukaryotes is a cyclical series of biological events that certain asexual cells go through. The cell cycle... Read More
Involution
Definition noun, plural: involutions (1) (biology) Reverting of the uterus and other genital organs to the pre-pregnant size... Read More
Sexual reproduction
Sexual reproduction is a mode of reproduction involving the fusion of haploid female gamete (egg cell) and haploid male... Read More
Development
1. The act of developing or disclosing that which is unknown; a gradual unfolding process by which anything is developed, as... Read More
What is a species? Definition of species, different approaches
What is the definition of species? What does it take to be considered as a species? Ever since there has been an array of... Read More