Which group of organisms has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom?

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

answer; ///i believe the answer your looking for is (ribosomes);