Sperm and eggs can be stored before they are released.
The digestive system can coil and provide greater surface area.
Muscle contractions against the fluid chambers are absorbed and have no effect.
Fluids here can assist respiration and circulation, and accumulate metabolic wastes.
Complex organ systems can develop protected from damage and temperature changes.
They both have spiral cleavage of the embryo.
The coelom develops in the same way in both.
The mouth forms first in both, before the anus.
They both form a hollow sphere in the embryo that has an indentation called a blastopore.
They both have indeterminate fate of the embryonic cells, so that separated cells all have the capacity to become a complete embryo.
Anus directly over the head
Torsion of the body so that the visceral mass is over the foot
Mantle may form gills or functional lungs
Carnivores use the radula to drill holes in shells of bivalves
Swimming larvae are found in all forms
Totally closed like ours, with arteries and veins.
Similar to ours with general closed vessels but no distinct arteries and veins.
An open system that mostly washes "blood" through the body cavities.
Totally absent; each body cell manages on its own to gain food and get rid of wastes.
Head, cephalothorax, and abdomen.
Cephalothorax, midsection, and abdomen.
Head, thorax, and abdomen.
Head, prothorax, and metathorax.
Head, cephalothorax, and genitalia.
Centipedes generally have fewer legs per segment.
The millipede is herbivorous, the centipede is carnivorous.
Large centipedes are dangerous to handle but millipedes are safe.
All of the above are correct.