What body system has akin (alike) functions to a liver system?

Look at the figure above. which atmospheric layer has around 80 percent of the mass of the earth's atmosphere? (hint: it's where the clouds seen on earth are formed.) a. exosphere b. troposphere c. stratosphere d. thermosphere

What type of cell is produced after fertilization occurs and the gametes combines ?

What was the land like over 500 million years ago? what was under the sea?