1. A study was created to test the effects of jazz on people's sleep patterns. The hypothesis of the experiment was that if people listened to jazz music as they fall asleep, they will sleep for longer
periods of time. For the experiment, 2 groups of people were created. One group was placed in a
quiet room where they went to sleep and they were timed on how long they slept. The other
group was placed in a room where jazz music played softly as they began to sleep and played
throughout the night. As each group awoke, their sleep times were monitored.
What is the dependent variable in this experiment?

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.

they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.