Babies cry when they are hungry or thirsty. When they cry their parents usually respond, go to and pick up the baby, and give hi
m or her food or milk. Over time, the baby learns that a parent will come when he or she cries. This is a type of learned response called Question 30 options:
The correct answer is A. C3H4 is the three-carbon alkene contains two double bonds. Alkenes are a class of organic compounds with carbon-carbon double bond. The structure for C3H4 is: <span> H2C=C=CH2</span>
