Which of the following is a serious threat to underground water supplies?

a) slow recharge rate b) impermeable rock layers
c) infiltration by acidic water
d) contamination by the water table

What are charcteristics of lithosphere?

Which best describes meiosis? a. it produces cells that are identical to the original cell b. it is responsible for the replacement of damaged skin cells c. it is responsible for growth of the organism d. it produces male and female sex cells

Transmission electron microscope are best for viewing a) microorganisms in pond water b) internal organs of a mouse c)internal structures of a cell d) surface features of a specimen