Question

1a. Explain the similarities and differences of aortic arches in the earthworm to the heart in the rat

b. How many gonads does the starfish have in total? What structure in the earthworm is similar?

Answer 1

• 1a.:- the heart and calciferous gland section makes up less than 5% of an earthworm total body length, no matter how big the individual worm gets.

functional similarity:- the aortic arches pump blood around the body often earthworm is similar way to animals that have only one multichambered heart. Worm heart don't have chambers. Worm also don't have lungs, they absorb oxygen through their skin and then it gets into their blood vessels.

• b:- each starfish arm contains 2 gonads.
• Earthworm can extend their pharynx through their mouth, just like the starfish that can extend their stomach out of their mouth.