Juan and Cindy are getting ready to go to prom. Cindy is lowering the temperature on the old, leaky air
conditioning unit that emits freon gas (CFCs). Juan, her date, is coming to pick Cindy up in his 4 ton Truck-a-
Saurus, which burns a lot of gas. The Truck-a-Saurus is fuel efficient at a rate of 2.3 miles per gallon. Cindy's
Per
father, Earl, is clearing a 500 acre forest behind their house in order to plant pole beans.
BORGES
ecce
BENESS
After Juan arrives, the three of them get into a heated argument about the environment. They each accuse the other of
contributing to ozone depletion and causing Earl's dog, Roscoe, to get skin cancer. Explain who is most guilty and why.

"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."

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.