Answer:
Explanation: Most female mammals have an estrous cycle, yet only ten primate species, four bats species, the elephant shrew, and one known species of spiny mouse have a menstrual cycle. As these groups are not closely related, it is likely that four distinct evolutionary events have caused menstruation to arise.
Answer:
The chemical and physical functions of the brain and how they work.
Explanation:
Psych is related to the mind and conscioussness, bio and biology are concerning the physical being and body. Therefore, combining them would be talking about both, hence how the brain (psych) works on a physical (bio) level.
A. the rise of the middle-class and the wide availability of affordable automobiles led to the development of suburban areas
