The Vampire squid first appeared before dinosaurs, about 300 million years ago. It has not gone through many changes during that time and is considered a living fossil.
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Mammals are diphyodont, meaning that they develop two sets of teeth. In humans, the first set (also called the "baby", "mil... -
A cell in late metaphase. All chromosomes (blue) but one have arrived at the metaphase plate. -
Jellyfish are found in every ocean, from the surface to the deep sea. Some hydrozoan jellyfish, or hydromedusae, inhabit freshwater; freshw... -
The kidneys receive blood from the renal arteries, left and right, which branch directly from the abdominal aorta. Despite their relatively... -
Emotion is a complex psychophysiological experience of an individual's state of mind as interacting with biochemical (internal) and env... -
The hippopotamus is one of the most aggressive creatures in the world and is often regarded as one of the most dangerous animals in Africa.... -
Many processes designed to preserve food will involve a number of food preservation methods. Preserving fruit, by turning it into jam, for ... -
As the retinal component of rhodopsin is derived from vitamin A, a deficiency of vitamin A causes a deficit in the pigment needed by rod ce... -
A chart showing three types of selection. 1. Disruptive selection 2. Stabilizing selection 3. Directional selection -
DNA structure. Bases are in the centre, surrounded by phosphate–sugar chains in a double helix.
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