Radium has a half-life of 1,620 years. How many years will a 1 kg sample of radium decay and reduce to 0.125 kg of radium?

A. 1,620 years

B. 3,240 years

C. 4,860 years

D. 6,480 years

The image shows embryos of three vertebrate classes

Food contains a sugar called ( ), which is broken down in a process called cellular ( ). this process uses ( ) to break down food molecules and provide energy for cells. fill in the parentheses

Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?