DNA is the molecule from which RNA is produced so the answer is:
a) the molecule from which RNA is produced
Answer: Confined aquifers tend to be much less vulnerable than unconfined ones, and deeper aquifers are less vulnerable than shallow ones. Steeper slopes mean that surface water tends to run off rather than infiltrate; and this can reduce the possibility of contamination.
Explanation: Learned this in school, no biggie though
Answer: D. there's no difference
Other statements didn't made sense so that's why It's D.
Hope this helps!!
Only 10 percent of the energy available within one trilogy level is transferred to the next trophic level.
Infertility is the incapacity to conceive an offspring while erectile dysfunction is the incapacity to get aroused so as to engage in sexual intercourse (mostly in men).
Erectile dysfunction could be caused by stress, cardiovascular diseases, and diabetes. Therefore treating it requires maintaining a healthy lifestyle of nutrition and exercise.
Infertility can be caused by disorders of reproductive organs such as endometriosis and occlusion in the tubes. This can be treated by assisted reproduction (IVF), corrective surgery and education.