Create a dichotomous key.

Aca tienes un ejemplo el formato lo cambia cuando lo envio por aqui me disculpo

Explanation:

Mosca grillo ciempiés  lombriz y babosa

Presenta patas              carece de patas

Mosca, grillo, ciempiés      lombriz y babosa  

Presenta seis patas   presenta + de 6 patas  presenta anillos     no tiene anillos

en el cuerpo          

lombriz                              babosa        

Mosca    ciempies

Grillo

Posee patas para saltar  no posee patas para saltar

Grillo      mosca

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.