Sensory nerves are fibers that ?
a. send signals toward the central nervous systemb. sent signals toward the peripheral nervous systemc. send signals to ward and receive signals from the peripheral nervous systemd. send signals to wards and receive signals from the central nervous system

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?