Problem: OPTIONS:
- fish
- arthropod
- mammals
- arachnid
Q: Q: What class of invertebrate animals has additional appendages called the chelicerae and the pedipalps? A:
Answer: arachnid

Problem:OPTIONS:
- experimentally
- organic science
- polygamy
- phylogeny

Q: What is the science that describes the ancestral and descendant connections between organisms? A:
****
A: phylogeny

Q: What type of electrons are attracted to the positive nucleus? A:
OPTIONS:
- turbulent electrons
- particular electrons
- passive electrons
- negative electrons
negative electrons

Q: What is a copy of an image formed by reflection or refraction? A:
OPTIONS:
- an example
- a photographic image
- a mirror image
- an image

Answer: an image

Question: Q: What do scientists attach to aquatic animals to collect information? A:
OPTIONS:
- ultraviolet tags
- radio tags
- fluorescent tags
- satellite tags
Answer: satellite tags

input: OPTIONS:
- motion
- momentum
- electromagnetism
- gravity Now, answer this question: Q: What is the invisible force that pulls things to earth? A:
A:
output:
gravity