question below:
A tight metal lid on a jar of pickles may loosen when it has been held in hot water. This is because the hot water causes the
OPTIONS:
- glass jar to contract
- metal lid to contract
- glass jar to expand more than the metal lid expands
- metal lid to expand more than the glass jar expands
answer below:
metal lid to expand more than the glass jar expands

question below:
Which of the following best describes a role of mushrooms in ecosystems?
OPTIONS:
- capturing energy from sunlight
- consuming living plant material
- taking energy from animal hosts
- breaking down dead plant material
answer below:
breaking down dead plant material

question below:
Which of the following is a central role of carbon in the chemistry of living organisms?
OPTIONS:
- Carbon can only bond with other carbon atoms.
- Carbon is a solvent that breaks chemical bonds.
- Carbon readily forms ionic bonds that separate easily.
- Carbon can form many types of molecules with covalent bonds.
answer below:
Carbon can form many types of molecules with covalent bonds.

question below:
What is the basic unit of life?
OPTIONS:
- atom
- cell
- element
- nucleus
answer below:
cell