Problem: OPTIONS:
- separates vein
- Back Vein
- skin vein
- umbilical vein
Q: Q: Capillaries in the chorionic villi filter fetal wastes out of the blood and return clean, oxygenated blood to the fetus through what? A:
Answer: umbilical vein

Problem:OPTIONS:
- mesosphere
- ozone layer
- crust
- stratosphere

Q: Planes fly in what layer of the atmosphere because there is less friction and turbulence? A:
****
A: stratosphere

Q: What happens to the level of relative humidity in the evening as air temperature declines? A:
OPTIONS:
- it goes up and down
- it falls
- nothing
- it rises
it rises

Q: In their pure form, all elements have an oxidation number of what? A:
OPTIONS:
- 3
- 2
- 7
- zero

Answer: zero

Question: Q: A penguin must do what before molting? A:
OPTIONS:
- hibernate
- use muscle mass
- mate
- increase muscle mass
Answer: increase muscle mass

input: OPTIONS:
- embryo
- fetus
- unfertilized egg
- fertilized egg Now, answer this question: Q: A sperm cell and an egg cell fuse to become what? A:
A:
output:
fertilized egg