The skin excretes (blank) which is made up of water, salts, and chemicals like urea. The (blank) excrete carbon dioxide and water.
The large intestine produces (blank)

that is then stored in the (blank)

and is excreted through the anus.

The answers to the blanks in the question in order is as follows:

- sweat

- lungs

- feaces

- Rectum

Explanation:

This question is describing the excretory organs and their excretory products. Excretion is the process by which waste products of metabolism are removed from the body system.

- As mentioned in the question, the SKIN is an excretory organ that excretes SWEAT which is made up of water, salts, and chemicals like urea.

- Lungs is another organ that excretes carbon dioxide (CO2) and water (H2O) as products of cellular respiration.

- The large intestine also produces FEACES, which is stored in the last part of the large intestine called RECTUM before it is excreted through the anus.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%