Approximately what amount of the Earth's surface area is covered by water? A) two thirds
B) four seventh
C) three fourths
D) one eighth ​

Dna and rna share a number of similarities, but they also differ in certain aspects of their structure. wich nitrogenous base is found in rna but is not found in dna

People with one sickle cell allele are not likely to get malaria. what is this an example of?

Physical characteristics of down syndrome