Rank the species from most closely related to horseflies to most distantly related to horseflies. if two species are equally close in their relatedness to horseflies, overlap them.

Flea is most closely related to horsefly, whereas silverfish is most distantly related to horsefly

Explanation:

The question image is given below. Here is the complete question with the transcribed Image Text;

This is one possible phylogenetic tree representing the relationships between some members of phylum Arthropoda. Use this phylogenetic tree and your knowledge of cladistics to determine the relationships between these species. Rank the species from most closely related to horseflies to most distantly related to horseflies. If two species are equally close in their relatedness to horseflies, overlap them.

↓↓↓ Most closely related species to the horsefly ↓↓↓

FLEA

KATYDID / HUMAN LOUSE

MAYFLY / DRAGONFLY

SILVERFISH

↑↑↑ Most distantly related species to the horsefly ↑↑↑

Note: A slash "/" is used to overlap species

Evolutionary relationships between organisms are shown by phylogenetic trees. The organisms that are most closely related have more common ancestor than the most distantly related species. Hence, in the picture of phylogenetic tree below, fleas are more closely related to horseflies, even though some other species look like horseflies than fleas do.

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.