explain how a woman's body prevents further ova (egg) from being released until the end of her preganancy?

In the ovaries, progesterone and estrogens are thought responsible for the release of an egg during ovulation. It is believed that if the egg is fertilized, these hormones are influential in the prevention of further egg release until the pregnancy has terminated.

Explanation:

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b