The body system most directly interacting with the skeletal system to enable hummingbirds to beat their wings between 60 and 200 times
per second is the-

E muscular system.

G. integumentary system.

H. endocrine system.

J. circulatory system.

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.

as in mitosis, dna replication occurs during interphase.   in meiosis, it occurs specifically in s phase of interphase 1.