18. During the nineteenth century, biologists knew that South America and Africa contained similar fossils. These fossils led them to believe that a temporary land
bridge between South America and Africa allowed ancient species to move between
both continents. In the twentieth century, evidence showed that South America and
Africa were once part of the same larger continent and that there were no land bridges
between them. How should biologists respond to the new geological finding?

i think its b

explanation:

"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."

not sure if this what   you'r looking for would be percent composition