You are a scientist trying to develop a technology that can be used to power wrist watches. which type of electromagnetic wave would be most useful to investigate?

EMF radiations

Explanation:

Electric and magnetic fields (EMFs) radiation is a terms collectively used for invisible energy waves governed by electricity and magnetic forces. These radiations are usually produced when some thing is operated by use of electrical power.

In watches , mercury or other ionizing battery cells are used to power the watch and hence it can be stated that EMF radiation are most useful to investigate.

Some time high frequency waves such as ultraviolet rays and X-rays are considered as form of EMF waves

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.