Scorpions give birth to live young which the mother carries on her back.

What class/phylum of animals has the fewest number of species among these choices? 

You are presented with an animal that resembles a jellyfish.  As you examine it further, which characteristic would allow you to conclude that it belongs to the Phylum Ctenophora rather than the Phylum Cnidaria?

Butterflies and moths are members of order Lepidoptera.

Predict what would happen to a sponge that could no longer produce choanocytes:

You are asked to study a new species, and are presented with a miniscule amount of DNA from that species.  If you do not find a way to increase the volume of the DNA sample, you will not be able to work with the sample at all.  Which technique should you use to increase the amount of DNA in the sample?

What is the route of water in the water vascular system of a starfish? 

Millipedes have two total legs per segment whereas centipedes have just one leg per segment.

Autotomy is the ability of an animal to lose a body part and subsequently regenerate it.

Each arm of the starfish differs internally, one being specialized for reproduction, another for respiration, a third for digestion, a fourth for the water vascular system, and the fifth for the nervous and circulatory systems.