Eventually, I replaced it with a full-size tire, but I've always wondered why manufacturers say you shouldn't use the spare for longer than necessary. Since the spare tire is used so infrequently, carmakers have switched to narrow, compact spares to save space and weight. Of course, a spare tire is a lifesaver when regular tires go pop, but leaving the temporary tire on for longer than the manufacturer recommends invites a host of problems. First, a temporary spare isn't as durable as a normal tire.
Cells have become specialized and form true tissues and cnidarians are the first group to have B nerve cells organized into a nerve net B sense organs (statocysts and ocelli) B extracellular digestion Cnidarian Body Plan The diploblastic cnidarians are radially or biradially symmetrical with oral and aboral ends.
Cell specialization can involve how stem cells change into the form specific units an organism such as cardiac, brain, and other organ tissues. An example non-specialized â¦ cell reproduction is mitosis creating identical cell types. What is specialization of cells? Each cell in an organism that performs specific tasks in order to maintain homeostasis, the constant internal conditions in an organism.