How are mechanical and chemical weathering similar? A - Both break down rock
B - Both build up up landforms
C - Both only occur when water is present.
D - Both change the composition of the rock. ​

Nitrofurantoin used during the fifth week of pregnancy places the neonate at risk for which condition?

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Which type of respiration takes place when there is no oxygen present? a. anaerobic b. mitochondrial c. cellular d. aerobica. anaerobic