If the ventral root of a reflex arc controlling leg movement is severed, what part of the nerve pathway will block the nerve impulse?

motor neuron
sensory neuron
interneuron
receptor

When does dna replication(make a copy of itself)?

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun