A scientist wants to perform a test that will indicate wether a nulciec acid sample is composed of RNA or DNA. Testing for the presences of which of the following is most approite in this situation?A) phosphate
B) nitrogen
C) guanine
D) uracil
E) thymine

economic impact of malaria is estimated to cost africa $12 billion every year. this figure factors in costs of health care, absenteeism, days lost in education, decreased productivity due to brain damage from cerebral malaria, and loss of investment and tourism.

true is the

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.