How do human beings contribute to the phosphorus and sulfur cycles?
a. deforestation

b. planting trees and shrubs

c. adding chemical fertilizers to the soil

d. introducing fish species to ponds and lakes

Which of the following is a cost of urbanization? a-cities can provide a high standard of living. b-cities are hubs of entertainment and education. c-paving over land changes the environment. d-job opportunities are greater in urban centers.

Dna has unique properties that allow it to accurately retain genetic information, even after multiple rounds of replication. one aspect of dna that allows it to accurately store genetic information is the base pairing from chargaff\'s first rule of the four nucleotide bases. if the c content of a dna molecule is 22%, what are the percentages of the remaining bases?

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box