What happens to cells during transformation

What is the starting point in replication called

Abird flies by moving its wings up and down. which two systems are most directly responsible for the movement of a bird's wings? a. skeletal and muscular systems b. respiratory and muscular systems c. skeletal and digestive systems d. respiratory and digestive systems

What amount of heat is exchanged when 106.2 grams of substance y goes from a liquid at 35 degrees