Hi,
The answer should be letter B, as H2O is a compound made of two different elements in a definite proportion.
B is the correct answer because all the classes are hierarchy’s in a sense
They cant be faster because they have smaller fins but thats just my logic hope i helped
The period you’ve described would be the G2 phase which is considered a “checkpoint” that determines whether or not a cell can enter the mitosis phase
On site means insitu.
invitro means in glass like a test tube.
