Suppose that a fossil fish was found in the rock layer below the layer with the shell. Which organism lived first? Explain your rationale.

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

Express the following number in scientific notation. 0.026890 =

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?