Two factors contributed to the success of the pteridophytes: the extreme miniaturization of the gametophytic generation and an important development of the sporophytic generation (development of the tree forms).
Pteridophytes are a group of plants that peaked in the Carboniferous (-300 million years). It is the first great terrestrial plant civilization. These plants would have appeared in the Devonian -400 million years ago, perhaps from certain primitive terrestrial plants which, unlike bryophytes, would have favored the diploid generation on the haploid generation.
Particularly well adapted to terrestrial life, they have created, thanks to the development of tree forms, immense forests whose fossilization is at the origin of coal deposits.
Pteridophytes are at the origin of an evolutionary lineage based on the extreme miniaturization of gametophytic generation and an important development of sporophytic generation, leading to all tracheophytes including current flowering plants. Pteridophytes are well adapted to terrestrial life, however fertilization still requires the presence of water since male gametes are swimmers.
20. Cell Membrane 19. Mitochondria 18.<span> Osmosis</span>
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Organs are structures made up of two or more tissues organized to carry out a particular function, and groups of organs with related functions make up the different organ systems.
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Stem cells in embryos generate all other tissues in the body. Opponents say the use of embryonic stem cells would encourage abortions.
Explanation:
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Stem cells in embryos generate all other tissues in the body. Opponents say the use of embryonic stem cells would encourage abortions.
The very large muscle which covers the top and sides of the skull from occipital bone to eyebrows is called:
Occipitofrontalis
