Tanks and submarines were easily simulated, since looking through goggles wasn’t very much different from looking through a pair of binoculars or a periscope. since the first head-mounted display was built for the pentagon in 1968, primitive versions of virtual reality have since proliferated to video arcades around the country.

which information from the excerpt best supports the inference that certain video games resulted from issues related to national security?
there has been a marked increase in war-themed games since the military developed conflict-based simulators.
there has been a marked increase in the development of new forms of entertainment since cuts to military spending have occurred.
there has been a marked increase in virtual reality games since the military developed conflict-based simulators.
there has been a marked increase in new forms of entertainment since the military’s budget was increased.

Magnesium is the fourth most abundant mineral in the body and is essential to good health. magnesium is needed for more than 300 biochemical reactions in the body. it maintain normal muscle and nerve function, keep bones strong, keep one’s heart rhythm steady, and supports a healthy immune system. magnesium also regulate blood sugar levels, promotes normal blood pressure, and may play a role in energy metabolism and protein synthesis. doctors and scientists are trying to determine whether magnesium may play a role in preventing and managing disorders such as hypertension, cardiovascular disease, and diabetes. which is the main idea of this paragraph? a. the role of magnesium in human nutrition is being studied intensely. b. magnesium may be related to the body’s metabolism and other healthy functions. c. magnesium appears to contribute to hypertension, cardiovascular disease, and diabetes. d. magnesium and a healthy immune system are separate diseases.

Read the sentence. on days when i go jogging in the morning, my mind seems to process ideas faster, and my mood is more positive. how does the underlined clause add variety and meaning to the sentence? select two options. it describes the days being discussed. it makes readers want to go jogging. it creates a compound-complex sentence. it adds detail about the speaker's personality. it explains why jogging is beneficial.

Is "they" an unstressed or stressed syllable?