Hemical compound that can cause algal blooms and cultural eutrophication in streams Answer A: Nitrates ( N O 3 with a negative 1 charge )

Answer B: Chlorofluorocarbons ( C F Cs )

Answer C: Nitrogen oxides ( N O x )

Answer D: Carbon dioxide (CO2)

Fossils can only be formed when? if mud, silt or tar is in the area to preserve the fossil ierosion does not occur and allows the fossil to form oxygen and microorganisms cannot decay the bones the area is dry and does not contain mud or silt

Which is the graph of the piecewise function f(x)? f(x) = image for option 1 image for option 2 image for option 3 image for option 4

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems