What form a spindle shaped structure of protein fibres on which the chromosomes move during nuclear division?

The type of fossil where the name literally means "turning to stone".

Ican construct an argument based on data about the risk and benefits of renewable and nonrenewable energy sources

Match each law or principle to its description. 1. law of original horizontality sediment continues to spread in a flat plane until it hits an edge or runs out of material. 2. law of superposition the youngest strata are at the top and the oldest are at the bottom. 3. law of original lateral continuity sediment gets pulled down by gravity in a horizontal and flat layer. 4. law of cross-cutting or intrusive relationships if there is a fracture or intrusive feature seen in rock strata, it is younger than the rock strata.