Answer:
1.) Why does menstruation begin?
A.) Period happens because of changes in hormones in the body.
2.) How long does the menstrual cycle usually last?
A.) the menstrual cycle lasts 21 to 35 days while bleeding between 2 to 7 days
<u>-TheUnknownScientist</u>
C. Immediately after mass extinction events D-50 million years after a background extinction event.
C. Is The Answer!
Organ, in biology, a group of tissues in a living organism that have been adapted to perform a specific function. In higher animals, organs are grouped into organ systems; e.g., the esophagus, stomach, and liver are organs of the digestive system.
The answer is D. How i remember is with the abbreviation KPCOFGS which is King Philip Came Over For Good Soup.(Kingdom Phylum Class Order Family Genus Species)
