Neurons are the building blocks of the nervous system. they process and transmit signals. in a neuron, the: 1a) cell membrane 1b)myelin sheath 1c)nucleus 2a)axon 2b)cell body 2c)dendrite

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

you know they are heterozygous for a trait because they have it as jj or jj.