What type of cell has no membrane bound nucleus

Explain why in any given geographical region, women tend to have lighter skins( by 3-4% on average) than men?

Which layer will become saturated first when rain falls?

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing