Explanation:
Echinoderms get their food and oxygen for energy. They use tube feet to obtain from the water. The tiny tube feet are involved in passing collected food towards the central mouth.These animals are detritivores performing similar functions to earthworms on the land in recycling nutrients.
Nerves - transmit impulse of sensation to brain or spinal cord, then to muscles and organs
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A test cross is used<span> to determine if a group exhibiting a dominant trait is homozygous or heterozygous for that trait.</span>
