The correct option is A. Scientists had discovered that some animals, such as Elysia chlorotica has the capacity to photosynthesize. The animal usually incorporate chloroplast into its cell from the algae which it feeds on. The chloroplast enable it to make proteins which are essential for photosynthesis.
The right answer is A. Some carry out photosynthesis...
The sea slug, Elysia chlorotica, is the first discovered animal able to use photosynthesis to produce energy. This photosynthesis is performed by the chloroplasts of its main food source, the seaweed Vaucheria litorea. They are sequestered by the digestive epithelium of the slug for several months according to a phenomenon of kleptoplasty, continuing their function of carrying out photosynthesis.
However, the chloroplasts of Vaucheria litorea have transferred a large part of their genes required for photosynthesis to the nucleus of the cells of this alga during evolution. Photosynthesis is nevertheless maintained in the sea slug thanks to the transfer of a gene necessary for photosynthesis from the kernel of the seaweed to the genotype of the slug.
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