Blogia
Un blog de Ciencias Naturales del IES Benjamín Jarnés (profesor: Fernando Patiño)

El reino animal

Con más de 2 millones de diferentes tipos de animales, el Reino Animal es el más grande de los reinos. Pero cuando se piensa en "animal", ¿qué imagen viene a la mente?. Mientras los mamíferos, pájaros, reptiles, anfibios y peces son los animales más conocidos por todos nosotros, aproximadamente la mitad de los animales en la Tierra pertenecen a un grupo de animales conocidos como "artrópodos". Los artrópodos incluyen animales como los ciempiés, los cangrejos, los insectos y las arañas. Con más de un millón de especies de artrópodos, ¡esto significa que la mayoría de los animales provienen de un grupo de criaturas que a la mayoría de las personas provoca escalofríos!.

¿Qué es exactamente un "animal"?. Con tal variedad de animales, es difícil imaginar que tienen en común. En primer lugar, los animales son "multicelulares" (compuestos por muchas células). En la mayoría de los animales estas células están organizadas en tejidos que crean diferentes órganos u sistemas de órganos. Segundo, todos los animales son heterótrofos (= "se alimentan de otros"); esto significa que obtienen sus alimentos mediante el consumo de otros organismos: plantas, hongos y otros animales. Las (plantas se conocen como autotrófos o "se auto alimentan") porque producen su propio alimento mediante la fotosíntesis). Además, todos los animales requieren de oxígeno para sus metabolismos, pueden sentir y responder al medio ambiente, y tienen la capacidad de reproducirse sexualmente (aún cuando también se pueden reproducir asexualmente). Durante su evolución desde un huevo fertilizado hasta adulto, todos los animales pasan a través de una serie de estadios embriónicos como parte de su ciclo normal de vida. Aún cuando los humanos y las ranas no se parecen mucho, comparten muchas características durante su fase embrionaría.

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laura natalia -

pongan informacion mas inportante

arcangel -

posss esta buen ala teoria graxias me acavo de salvar kn la exp. jaja prrrrahs
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naomi -

grasias por los datos jeje esk es para una tarea psss meda flojera leer jajajaja grasias heee

julieta -

gracias por lo del reino animal estuvo de pelos

[ariih]¬¬¬ -

ai muchas gracias!
xqe por esta pagina me salbo de el trab prec. de biologia!!
grax grax!

kiiki -

jajaja

ANNY -

LES INFORMO K TODA LA INFORMACION K AKI SE ENCUENTRA ES MUY BARIABLE A PESAR SE SU EXTENCION
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