Answer:
The ectoderm develops into the surface ectoderm, neural crest, and the neural tube. The surface ectoderm develops into: epidermis, hair, nails, lens of the eye, sebaceous glands, cornea, tooth enamel, the epithelium of the mouth and nose.
i don't really know what you're asking. But, if you're asking what the main energy source is then it would be the sun.
Explanation:
it's the first one
