The earths crust is
A. mostly made of iron and nickel
B. in motion because of convection currents in the mantle
C. Thicker under the ocean than under the continents
D. made of one large piece called the crustal plate

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil

According to cell theory; which structures carry out the basic function of living things? a. atoms b. organs c. cells b. nuclei