What does the fossil record present tell us about the modern whale? a) the modern whale currently has hind legs. b) the modern whale evolved from an organism that had hind legs. c) the modern whale just randomly showed up in the fossil record. d) the modern whale has not evolved, and has been present in the fossil record starting 50 million years ago.

Option B

Explanation:

The fossil records of the first whale on planet earth i.e Pakicetus have evolved some 50 million year ago along with hippos. In fact these two species share a common ancestry with an organism that has following characteristics –

a)Dwell on land or was a terrestrial animal  

b)Has two hind limbs and two rear limbs

c)Must be having skulls  

d)Must have carnivorous teeth

Hence, option B is correct

"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."