The nucleus, water in them, organelles.
Hoped this helped.
~Bob Ross®
Answer: Nervous
Explanation: It's the nervous system
Tephra<span> Greek, for </span>ash<span> is a generic </span>term<span> for any airborne pyroclastic accumulation. ... Within this size classification, specific types of </span>tephra<span> can be further </span>defined<span> by ... Some </span>lapilli<span>- to </span>bomb<span>-size pyroclasts maintain a frothy appearance. </span>
