April rubs a felt cloth against a plastic rod to charge the cloth and the rod. What type of charging is this? HINT: Are the felt cloth and plastic rod considered conductors or insulators? Do they touch or are they just brought close together?

The duration of a photographic flash is related to an rc time constantly

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.