21 The flowers that feed hummingbirds have long tube-like pedals. Suppose the flower pedals grew even longer. The only
hummingbirds who could get to the nectar were hummingbirds with the longest beaks. What type of selection is this?
A Stabilizing selection
B Disruptive selection
Directional spection
D Sexual selection

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Explanation:

is there a diagram

"menstrual cycle is a complex cycle that consists of several processes. order of occurrence of steps in menstrual cycle are as follows:

1. high progesterone levels maintain the endometrium lining of the uterus.

2. endometrium lining breaks down and low levels of estrogen stimulate the pituitary to release fsh and lh.

3. fsh and lh stimulates the follicles to develop and the oocyte to produce estrogen.

4. rising estrogen levels suppress fsh production and development of other follicles.

5. a spike in lh causes follicle to rupture.

6. a breakdown of corpus luteum causes progesterone level to drop."