Which term best completes the following analogy? Elements : Atoms: Covalent compounds:

A. Bonds

B. lons

C. Mixtures

D. Molecules

If an organ has six haploid chromosomes,how many chromosomes are present. 6 12

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?

Which fossil organism in whale evolution do you think was the first to live mostly in water? explain your claim with evidence and reasoning?