Tienen fecundacion y desarrollo embrionario dentro de la madre, al menos en parte.
En ese tipo de reproduccion una celula da origen a dos nuevas identicas entre si.
Un ovulo sin fecundar se desarrolla hasta convertirse en un nuevo individuo.
Celulas que forman los tejidos y organos de un ser vivo.
Se realiza fuera del cuerpo de la hembra, se expulsan miles de millones de gametos.
Es cuando los animales tienen organos reproductores o estructuras donde forman gametos.
Tiempo de cambios hormonales durante el cual las hembras aceptan al macho para el aparamiento.
Saco membranoso que contiene el liquido en el que el embrion esta flotando permitiendo su desarrollo.
Embrion de los mamiferos placentarios.
El macho deposita los espermatozoides en el sistema reproductor femenino.
Descendientes de los amfibios, fueron los primeros vertebrados terrestres en lograr formar un huevo con suficiente cantidad de nutrimentos.
Tienen placenta, una estructura que se forma dentro del utero y mediante la cual se realiza intercambio alimentario, respiratorio y excretor.
Down
Ponen huevos como el ornitorrinco y el equidna.
Adaptacion relacionada con la reproduccion y el ambiente.
El cuerpo del animal se divide en dos o mas partes y de cada una surge un individuo completo.
Conjunto de carcateristicas fisicas que distiguen a machos y hembras.
Comportamiento de los animales destinados a atraer a individuos del sexo opuesto.
Es la union de un ovulo y del nucleo de una celula somatica.
Se realiza dentro del cuerpo de la hembra.
Ocurre cuando los gametos masulinos y feminos se unen.
Gametos femeninos fecundados.
Individuo que posee estructuras reproducctoras de ambos sexos.
Se desarrollan en el agua o cerca de ella pues sus huevecillos necesitan estar en ese liquido para sobrevivir.
En alguna parte del cuerpo del animal un grupo de celulas se divide para formar un brote o yema.
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It prints on two pages.
Big puzzles won’t always print on one page — the clues and grid are the smallest we could make them while keeping them readable for everyone.
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