1.) describe specialized feeding structures of parasitic platyhelminths.
2.) some parasitic flatworms have a very complicated life cycle with more than one host. infer why this might be adaptive.
3.) how do free-living nematodes contribute to the carbon cycle?
4.)apply what you know about pinworms to develop one or more recommendations for preventing pinworm infections in humans.
5.) platyhelminths and nematodes are both worms. justify classifying them in different invertebrate phyla.

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.