The photoreceptors of the retina

a. convert chemical signals into electrical signals
b. convert sound waves into electrochemical signals
c. convert light energy into electrochemical signals
d. convert light energy into electromagnetic signals

Option c

Explanation:

The photoreceptors are found in the eyes of the human body. These receptors absorbs light from the surrounding and converts it into electrochemical signal.

The signals from eyes are are transferred to the brain so that we can see the objects and recognize it.The signals are transferred through the neurotransmitter.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.