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Evolutionary history of plants. A late Silurian sporangium, artificially colored. Green: A spore tetrad. Blue: A spore bearing a trilete mark – the Y -shaped scar. The spores are about 30–35 μm across. The evolution of plants has resulted in a wide range of complexity, from the earliest algal mats of unicellular archaeplastids evolved ...
Abiogenesis. Stages in the origin of life range from the well-understood, such as the habitable Earth and the abiotic synthesis of simple molecules, to the largely unknown, like the derivation of the last universal common ancestor (LUCA) with its complex molecular functionalities. [ 1]
Decoupage or découpage ( / ˌdeɪkuːˈpɑːʒ /; [ 1] French: [dekupaʒ]) is the art of decorating an object by gluing colored paper cutouts onto it in combination with special paint effects, gold leaf, and other decorative elements. Commonly, an object like a small box or an item of furniture is covered by cutouts from magazines or from ...
Caviar (also known as caviare, originally from the Persian: خاویار, romanized : khâvyâr, lit. 'egg-bearing') is a food consisting of salt-cured roe of the family Acipenseridae. Caviar is considered a delicacy and is eaten as a garnish or spread. [ 1] Traditionally, the term caviar refers only to roe from wild sturgeon in the Caspian Sea ...
Oogenesis. Oogenesis, ovogenesis, or oögenesis ( / ˌoʊ.əˈdʒɛnɪsɪs / [ 1]) is the differentiation of the ovum (egg cell) into a cell competent to further develop when fertilized. [ 2] It is developed from the primary oocyte by maturation. Oogenesis is initiated in the embryonic stage.
The egg cell or ovum ( pl.: ova) is the female reproductive cell, or gamete, [ 1] in most anisogamous organisms (organisms that reproduce sexually with a larger, female gamete and a smaller, male one). The term is used when the female gamete is not capable of movement (non- motile ). If the male gamete ( sperm) is capable of movement, the type ...
An estimated 1.2 million tons have been produced globally. [9] Though the EPA enforced the federal ban as of 1978, PCBs continued to create health problems in later years through their continued presence in soil and sediment, and from products which were made before 1979. [10]
The eel-like larvae hatch out of the eggs and make their way to water. They have three pairs of external red feathery gills, a blunt head with two rudimentary eyes, a lateral line system and a short tail with fins. They swim by undulating their body from side to side. They are mostly active at night, soon lose their gills and make sorties onto ...