Which of the following would not diffuse through the plasma membrane by means of simple diffusion?

a lipid-soluble vitamin
a steroid hormone
oxygen
glucose

Which flexible structure that supports the nerve cord and led to the backbone

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food

In general, are there any major differences that you can see? explain