Wild animals are commonly divided into groups with similar characteristics. the two categories used for mammals are:

Category used for these mammals is Order Carnivora.

Explanation:

Order Carnivora is divided into:

(1). Cat family which is Felidae and

(2). Dog family which is Canidae

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explanation:

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.