Plants, such as sunflowers, contain specialized receptor cells that respond to light and grow in the direction of a light source. these specialized plant cells exhibit

Photoreceptor proteins are light-sensitive proteins involved in the sensing and response to light in a variety of organisms. Some examples are rhodopsin in the photoreceptor cells of the vertebrate retina,phytochrome in plants, and bacteriorhodopsin and bacteriophytochromes in some bacteria.

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Ithink the answer is b, demographic transition theory.