Which of the following is true about fossils? A.
Fossils found in lower layers of sedimentary rock are
as old as fossils found in upper layers of sedimentary rock.
B.
Fossils found in lower layers of sedimentary rock are
older than fossils found in upper layers of sedimentary rock.
C.
Fossils found in upper layers of sedimentary rock are
older than fossils found in lower layers of sedimentary rock.
D.
The relative age of fossils cannot be determined from their
position in sedimentary layers.

What is the nature of the ca-cl bond in a molecule of calcium chloride (cacl2) if the electronegativity value of calcium is 1.0 and that of chlorine is 3.16?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.