How do three- to six-month-old children usually communicate?

a. in word strings comprised of two words
b. in three-or-more word sentences
c. by cooing
d. in one-word sentences

C: By cooing
I know this because I have a 6 month old nephew 
and he coos away :)

Ican answer some, but not all! 2.) sensory info not being transmitted to the brian will result in a lack of responses that could be life saving. 4.) sensory adaption will helo people recognize certain images or objects that will give them a clearer understanding and expand their knowledge. them also become familiar with their surroundings. 8.) light the retina detect an object as it passes through the pupil and into the retina. 12.) cones in the retina us see color. they us see red. blue and green