Answer the following question given this paragraph: The disintegration of unstable nuclei does not occur all at once. The rate of disintegration is a statistical process. The most convenient way to consider it is by a concept known as half-life . The time required for half of the atoms in any given quantity of a radioactive substance to decay is the half-life of that element. Each particular isotope has its own half-life. For example, the half-life of radium-226 is 1600 years. That is, beginning with 1.00 gram of radium-226, it would take 1600 years for half of it to decay and leave 0.50 gram remaining. After another 1600 years, only 0.25 gram would remain. In each half-life, exactly half of the beginning amount decays. Q: What is the time it takes for radioactive substance to decay? A:
OPTIONS:
- decay rate
- full-life
- deterioration rate
- half-life

Answer: half-life

Question: Answer the following question given this paragraph: Q: What is the term for an infection caused by a fungal parasite? A:
OPTIONS:
- mydriasis
- mitosis
- acrobasis
- mycosis
Answer: mycosis

input with options: Answer the following question given this paragraph: Bones become increasingly ossified and grow larger during fetal development, childhood, and adolescence. When skeletal maturity is reached at about age 20, no additional growth in bone length can occur. Q: At what age is skeletal maturity reached by humans? A:
OPTIONS:
- 40
- 30
- 15
- 20
output: 20

Q: Answer the following question given this paragraph: The deeper water of a lake makes up the profundal zone. There isn't enough light for photosynthesis in this zone, so most organisms here eat dead organisms that drift down from the water above. Organisms in the profundal zone may include clams, snails, and some species of fish. Q: What do most organisms eat in the profundal zone of a lake? A:

OPTIONS:
- fresh organisms
- algae organism
- fish waste
- dead organisms

A: dead organisms

input: OPTIONS:
- fluid waves
- mechanical currents
- magnetic waves
- mechanical waves Now, answer this question: Answer the following question given this paragraph: Mechanical waves are waves that transfer energy through matter, called the medium. Mechanical waves start when a source of energy causes a disturbance in the medium. Types of mechanical waves include transverse, longitudinal, and surface waves. Q: What type of waves start when a source of energy causes a disturbance in the medium? A:
A:
output: mechanical waves

Question: Answer the following question given this paragraph: Once a sand dune forms, it may slowly migrate over the land. The wind moves grains of sand up the gently sloping side of the dune. This is done by saltation. When the sand grains reach the top of the dune, they slip down the steeper side. The grains are pulled by gravity. The constant movement of sand up and over the dune causes the dune to move along the ground. It always moves in the same direction that the wind usually blows. Can you explain why?. Q: The migration of what familiar coastal landform involves saltation and gravity? A:
OPTIONS:
- volcanos
- lakes
- rivers
- sand dunes
Answer:
sand dunes