1 Atoms of the same element with different numbers of neutrons are defined as: o
neutrons
O
isotopes
O
elements
O
compounds

15. which of the following is not human-caused groundwater pollution? a. water in an aquifer dissolves elements such as arsenic and mercury from surrounding rock. b. water in an aquifer is contaminated by leachate that seeps into the ground from a landfill. c. water in an aquifer becomes polluted with chemicals used in hydraulic fracturing, or fracking. d. water in an aquifer absorbs harmful bacteria from the drainage field of a septic tank.

What is a difference between a mixture of elements and a mixture of compounds

In which phase of mitosis do the spindle fibers pull the chromosomes apart to opposite sides of the cell ?