Problem: OPTIONS:
- triploid
- monoplooid
- monoxoid
- diploid
Q: Q: Plants alternate between haploid and what? A:
Answer: diploid

Problem:OPTIONS:
- waterproofness
- webbed feet
- bonelessness
- flightlessness

Q: What important and unusual physical property (for birds) do ostriches and penguins share? A:
****
A: flightlessness

Q: What is a large space that helps the organism digest & move nutrients around the cnidarian body? A:
OPTIONS:
- thorax
- abdominal wall
- vacuole
- gastrovascular cavity
gastrovascular cavity

Q: What is the force that causes objects to fall down to the ground? A:
OPTIONS:
- velocity
- pull
- motion
- gravity

Answer: gravity

Question: Q: What is an interesting example of a molecule with two central atoms, which are both c atoms? A:
OPTIONS:
- chloride
- water
- sulfur
- acetylene
Answer: acetylene

input: OPTIONS:
- life extinctions
- earthquakes
- starvations
- mass extinctions Now, answer this question: Q: Most, if not all, of the extant animal phyla today evolved during the cambrian period, yet many of what devastating events have taken place since then? A:
A:
output:
mass extinctions