How does facilitated diffusion differ from simple diffusion?
o
energy is needed to move molecules through the cell membrane.
o no energy is needed to move molecules through the cell membrane.
o
molecules diffuse through the cell membrane.
o
molecules diffuse through transport proteins.

answer; (phospholipid);

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if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?