Ils se produisent à travers quatre étapes essentielles du développement animal précoce: Fertilisation: processus consistant à combiner un seul spermatozoïde avec un seul ovule pour former un zygote. Clivage: cycles multiples et rapides de division cellulaire mitotique où la taille globale de l'embryon n'augmente pas. L'embryon en développement est appelé blastula une fois le clivage terminé. Gastrulation: le réarrangement (mouvement) spectaculaire des cellules de la blastula pour créer les couches de tissu embryonnaire. Ces couches de tissus continueront à produire les tissus et les organes de l'animal adulte. Organogenèse: processus de formation d'organes et de tissus via la division et la différenciation cellulaire.
They occur through four essential stages of early animal development: Fertilization: the process of combining a single sperm with a single egg to form a zygote. Cleavage: multiple and rapid cycles of mitotic cell division where the overall size of the embryo does not increase. The developing embryo is called a blastula after cleavage is complete. Gastrulation: the spectacular rearrangement (movement) of the blastula cells to create layers of embryonic tissue. These layers of tissue will continue to produce the tissues and organs of the adult animal. Organogenesis: process of organ and tissue formation via cell division and differentiation.
Saturated fatty acids are chains of single bonded carbons surrounded by hydrogen atoms.
Unsaturated fatty acids have bent structures due to double bonding between carbon atoms in the chain. When carbons create double bonds with each other they are no longer able to hold as many hydrogens as a saturated fatty acid
Fusion and gravity keep the sun from blowing itself up. A large amount of energy is released by the
sun. Protons are fused together to form helium atoms due to the high heat and
pressure at the center of the sun. The Sun does not blow itself up from the
outer pressure of nuclear fusion in as much as the inner force of gravity
balances it.
