#34 Earthworm II Nervous and Circulatory System 12. The earthworm has a ventral nerve cord, why is this design be benificial for the worm? (Think about how it moves). 13. The earthworm has a closed circulatory system. Define what this means. What is the name of the 14. How many "hearts" does the earthworm have? earthworms hearts? 15. The earthworm does not have a respiratory system. Explain then how the earthworms exchanges gases

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).