How many atoms of chlorine would a molecule of carbon tetrachloride have?
a. 0
c. 4
b. 1
d. 7

During which movies do spring tides new moon first quarter waxing gibbous waxing

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?