What is a fossil that is found in a layer above another fossil? ! ; -;

When does dna replication(make a copy of itself)?

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

Describe the relationship and movement between temperature and density in a convection cell. make sure you identify the direction of travel