Which is the last step in excavation of the skeletal remains? A.
defining the investigation area
B.
identifying the layout of the remains
C.
exposing the remains
D.
screening of the soil
E.
lifting the remains

the areas around the equator

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate