Many strepsirhines move a. by arm swinging b. by vertical clinging and leaping c. with bipedal walking d. by mostly swimming

The correct answer is option b. by vertical clinging and leaping.

The strepsirrhines  are the primates, which follow VCL or vertical clinging and leaping type locomotion. This is a type of arboreal locomotion, used by the haplorrhine tarsiers also.

In the VCL type of locomotion, the animals generally rest with an upright torso, a fixed elbow and clinging with the help of hands on a vertical support, such as the sides of the trees or the bamboo stalk.

the correct option is option d

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.