Problem:OPTIONS:
- oxygen
- hydrogen
- carbon
- nitrogen

Q: Each nitrogenous base has one or two rings that include which atoms? A:
****
A: nitrogen

Q: Animals that have been modified to express recombinant dna are called what? A:
OPTIONS:
- reproducing animals
- mammalian animals
- aquatic animals
- transgenic animals
transgenic animals

Q: In a tropical rainforest, where are ferns common? A:
OPTIONS:
- forrest floor
- emergent
- canopy
- understory

Answer: understory

Question: Q: In which period of the periodic table is nickel found? A:
OPTIONS:
- First Period
- Second Period
- Third Period
- fourth period
Answer: fourth period

input with options: Q: What is the term for the movement of substances due to random thermal molecular motion? A:
OPTIONS:
- Transfusion
- convection
- condensation
- diffusion
output: diffusion

Problem: OPTIONS:
- fish sac
- dish sac
- eye sac
- yolk sac
Q: Q: Yolk is a very fragile substance found in the eggs of reptiles and needs protection. what serves as protection for the yolk? A:
Answer:
yolk sac