Q: What begins approximately six weeks after fertilization in an embryo? A:
OPTIONS:
- calcification
- elongation
- incubation
- ossification
ossification

Q: Wavelengths are described by a unit of what? A:
OPTIONS:
- weight
- direction
- speed
- distance

Answer: distance

Question: Q: Unlike nuclear fission, which involves dangerous radioisotopes, nuclear fusion involves what two harmless elements? A:
OPTIONS:
- magnesium and helium
- hydrogen and oxygen
- hydrogen and carbon
- hydrogen and helium
Answer: hydrogen and helium

input with options: Q: What is type of substance is formed when water vapor condenses or when ice melts? A:
OPTIONS:
- toxic water
- chemical water
- gaseous water
- liquid water
output: liquid water

Q: Q: What kind of beneficial relationships with other organisms are common in the plant kingdom? A:

OPTIONS:
- symbiotic
- Host
- autotrophic
- mutualistic

A: mutualistic

Q: One of the most advanced uses of what in medicine is the positron emission tomography scanner, which detects the activity in the body of a very small injection of radioactive glucose? A:
OPTIONS:
- radionuclides
- quarks
- membranes
- radioisotopes
radioisotopes