Neural crest cells appear on the edges of the neural tube and spread throughout the embryo, giving rise to all of the following structures except . Neural crest cells appear on the edges of the neural tube and spread throughout the embryo, giving rise to all of the following structures except . pharyngeal slits (or clefts) of invertebrate chordates some of the bones and cartilage of the skull sensory capsules in which eyes and other sense organs develop. teeth

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

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.

japan is the correct anwser because i already took the test and i passed it