480kg into the ratio 1:3:4

x = 60

Step-by-step explanation:

cement: 1x = 60kg

sand : 3x = 3*60 = 180kg

gravel : 4x = 4*60 = 240kg

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