10.If urea (46 - 0 - 0) cost $480.00 per ton and ammonium sulfate (21 - 0 - 0) cost $265.00 per ton , which fertilizer would be the most economical source of nitrogen ? Explain .

If the birth rate of a population of dolphins is 2.0, the death rate is 0.5, and the population size is 100, what is this dolphin's population growth?

In the african savanna,more wildebeests are born than the environment can support. which is most likely to happen over a period of years as a result

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen