convergent evolution - called analogy
a potential source of confusion in constructing a phylogeny is similarity between organisms that is due to convergent evolution - called analogy - rather than to shared ancestry. thus for mammals, the backbone is a shared ancestral character, a character that originated in an ancestor of the taxon
The answer is B seminal vesicles
Carbon is Carbon so it's just one atom.
Air is mostly O2, N2, H2O and ....
Salt is NaCl and not one atom ;)
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observation gives you answers. Patterns, motion, matter, time etc
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well for me i don't think so cause you see now a days that parents treat their children equally they don't have to spoil the son and forgets nout the daughter, parents are equally to their kids and in that case their will be no discrimination at all