Answer:
To develop a molecular clock, you need to find which of the following?
a sequence of molecules
the rate at which changes occur in a type of molecule
how much total change has occurred in a type of molecule from two different species
how many molecules a species has
Step-by-step explanation:
dsk'fa
Answer:
x = 60
Step-by-step explanation:
cement: 1x = 60kg
sand : 3x = 3*60 = 180kg
gravel : 4x = 4*60 = 240kg
