Which is the best example of physical weathering? A. the cracking of rock caused by the freezing and thawing of water.
B. the transportation of sediment in a stream
C. the reaction of limestone with acid rainwater
D. the formation of a sandbar along the side of a stream

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

Look at the photo of the leaf. which term best describes this leaf?

Describe two recent or ongoing space missions.