The endoplasmic reticulum can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function. The rough endoplasmic reticulum has on it ribosomes, which are small, round organelles whose function it is to make those proteins.
Particle overkill Energy has decreased, causing a stronger attraction between the particles. Freezing implies the removal of the heat of an object
It's A. Temperature changes modify the enzyme shape, so they no longer fits.
What he did was say that evolution happened that over time the birds seemed to be changing
D. Chlorophyll a
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