Ablackened, solid copper sphere of radius 4.00 cm hangs in a vacuum in an enclosure whose walls have a temperature of 20.0°c. if the sphere is initially at 0°c, find the rate at which its temperature changes, assuming that heat is transferred by radiation.

19 hertz bruh u trippin? ?

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction

Ithink the answer is c. make unnecessarily  wide gestures 

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.