Mitochondria by using cellular respiration to make ATP
This is true. Hope this helps.
The echinoderm with long spines
belongs to the class Echinoidea which includes sea urchins, heart urchins, cake
urchins and sand dollars. This spine serves as their protective mechanism from
predators. The spines are joined to the skeleton and muscles surround it. The muscles
enable them to swivel its spines from predators.
An activity recommended when working with free weights is to do like an overhead press ie with the barbell, lift it up to the waist, then thrust it into the air higher than the head and lower it in the same step by step fashion. With the dumbells, one can use a bench and lie back on it and do a pec dec fly bringing the dumbbells towards each other.