What is the main principle behind the law of conservation of matter?

A
Mass does not change phase during a reaction.

b
The total mass does not change during a reaction.

c
Heat is added during a reaction for the mass to remain constant.

D
Mass will always remain constant unless a change has occurred.

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

What's the waste product of electrons and pyruvate combining in fermentation?  

2. which of the following statements does not accurately describe stem cells? a. embryonic stem cells make up the inner cell mass of a blastocyst. b. with more research, stem cells may be used to repair or replace damaged cells. c. the use of stem cells is without any objections since it can be used in therapies to humans. d. adult stem cells are multipotent and can differentiate into many types of cells.