PLS HELPPP I NEED HELP WITH 1 AND 3

ha well ok then answer is I didn't know that was a little bit of time with the answer is

Babies communicate from birth, through sounds (crying, cooing, squealing), facial expressions (eye contact, smiling, grimacing) and gestures/body movements (moving legs in excitement or distress, and later, gestures like pointing.)

physical, cognitive, emotional and social. Human development is comprised of four major domains: physical development, cognitive development, social-emotional development, and language development

the gravitational force on an object increase as the mass of an object also, im not going to report you, but this question should be under the science category, not health

teens need 8-10 hours of sleep. it kind of depends on what time you get up. but prob around 10 or 11 p.m. or 11 or 11: 30 p.m.