A student claims that a magnetic field can affect objects that are not in direct contact with each other. Which
argument best supports the students claim?

A ball rolls downhill and eventually comes to a stop.

A light bulb becomes hot to the touch after being lit.

A compass needle points to the north from any location.

Alighting bolt releases a charge from the sky to the ground.

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

In which layer do organisms on earth love?

Assume that you are interested in separating short (200-400 bp) dna molecules from a pool of longer molecules in the 10,000-20,000 nucleotide range. you have two recipes for making your polyacrylamide gels: one recipe uses 1.5 percent agarose and would be considered a “hard gel,” while the other uses 0.5 percent agarose and would be considered a loose gel. which gel should you use to separate the short (200-400 bp) dna molecules from a pool of longer molecules in the 10,000-20,000 nucleotide range?