Provide evidence that supports the hypothesis that liverworts were the first Land plants

Me the formula cacl2 represents the compound

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

Witch theory suggests all living things are made up of cell or cells