input: OPTIONS:
- their teachers
- their guesses
- their faith
- their hypothesis Now, answer this question: Answer the following question given this paragraph: The experiment is a cornerstone in the scientific approach to gaining deeper knowledge about the natural world. Scientists use the principles of their hypothesis to make predictions, and then test them to see if their predictions are to be confirmed or rejected. Q: Scientists use the principles of what to make predictions, which they then test? A:
A:
output: their hypothesis

Answer the following question given this paragraph: Both stages of photosynthesis take place in chloroplasts. The light reactions take place in the thylakoid membranes, and the Calvin cycle takes place in the stroma. Q: The light reactions take place in which membranes? A:

OPTIONS:
- the cell membranes
- the phospholipid
- the stroma
- the thylakoid

Answer: the thylakoid

Problem: OPTIONS:
- one
- five
- three
- four
Q: Answer the following question given this paragraph: Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemical compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids. ) Proteins contain carbon, hydrogen, oxygen, nitrogen, and sulfur. Protein molecules consist of one or more chains of small molecules called amino acids. Q: How many classes of biochemical compounds are there? A:
Answer: four

Problem:OPTIONS:
- the reflex vacuole
- the elongated vacuole
- the bare vacuole
- the contractile vacuole

Answer the following question given this paragraph: The contractile vacuole is the star-like structure within the paramecia. Q: What is the star-like structure inside the paramecia? A:
****
A: the contractile vacuole

Answer the following question given this paragraph: One common example of an extra-chromosome disorder is Down syndrome ( Figure below ). Children with Down syndrome are mentally disabled and also have physical deformities. Down syndrome occurs when a baby receives an extra chromosome 21 from one of his or her parents. Usually, a child will receive one chromosome 21 from the mother and one chromosome 21 from the father. In an individual with Down syndrome, however, there are three copies of chromosome 21 ( Figure below ). Therefore, Down syndrome is also known as Trisomy 21. These people have 47 total chromosomes. Q: What's the most common disorder from having an extra chromosome? A:
OPTIONS:
- Williams syndrome
- Turner syndrome
- cri-du-chat syndrome
- down syndrome
down syndrome

Answer the following question given this paragraph: Although air can transfer heat rapidly by convection, it is a poor conductor and thus a good insulator. The amount of available space for airflow determines whether air acts as an insulator or conductor. The space between the inside and outside walls of a house, for example, is about 9 cm (3.5 in) large enough for convection to work effectively. The addition of wall insulation prevents airflow, so heat loss (or gain) is decreased. Similarly, the gap between the two panes of a double-paned window is about 1 cm, which prevents convection and takes advantage of air's low conductivity to prevent greater loss. Fur, fiber, and fiberglass also take advantage of the low conductivity of air by trapping it in spaces too small to support convection, as shown in the figure. Fur and feathers are lightweight and thus ideal for the protection of animals. Q: Although air can transfer heat rapidly by convection, it is a poor conductor and thus a good what? A:
OPTIONS:
- magnet
- absorber
- transporter
- insulator

Answer:
insulator