A scientist could use DNA as a molecular clock to do which of the following?
To determine the age of a very old rock
To determine the amount of DNA in a person's body
To determine how long ago two species of animals shared an ancestor
To determine how many offspring a chicken has during its lifetime

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

Iwll give extra points to who gets this for ! what type of reaction is this? ?

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.