4. Students at a University were split into two groups for a Marine Science course course One group received a traditional textbook, while the other received a digital textbook After the course, the final
exam grades between the two groups of students were compared
Independent Variable: text book
Dependent Variable fine exam grades
Control Variables:
5. According to the records, in 2018 there was a record low number of clams and oysters in the Gulf of

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.