The average menstrual cycle is about 28 days long, ovulation occurs on about day 14 . The menstrual cycle can be divided into three continuous phases. Starting with menses, proliferative and then the secretory phase. Normally menstruation occurs when blood levels of both female hormones decrease rapidly.
Answer:
excretory and respiratory
B. It provides information about why certain measurements are made in an experiment
From experience, to be able to have background research helps in the design of an experiment because it would tell you what is being measured in a experiment. Without the background information, my whole class got lost on what to do until my teacher told us what we had to measure and how we could measure the experiment.
Answer:
Plant and animal cells.
Explanation:
Found in every eukaryotic cell.
I believe the answer is a earthworm
