Which of the following soil has air space and is loosely packed? Sandy soil

Clayey soil

Loamy soil

All of the above

Sandy soil

Explanation:

Sandy soil consists of large particles that are loosely packed with large air spaces between them.

Since sand particles are quite large, they cannot fit close together, so there are large spaces between them. These spaces are filled with air.

"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."