A fern dies and is buried beneath many layers of mud, sand, and/or soil. Many years pass, and the mud, sand, and/or soil harden and turn to rock. Years of erosion erode the top layers of rock away. Eventually, the fossil, which is in the same shape as the fern, appears on the top.
A. Amber
B. Mold
C. Cast
D. Imprint
E. Petrified

Describe the function of the endomembrane system? what organelles are involved?

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes

Which correctly describes crossing over ?