According to paragraph 8, how do the brain and the individual cells of an animal work together to influence
the animal's circadian rhythms?
1. Each part of the brain is responsible for causing
cells in a different part of the animal's body to
become active at specific times.
2. A central timer in the brain coordinates many
smaller timekeeping sequences that are
controlled by specific genes within each cell.
3. The cells measure short periods of time from
seconds to hours, while the brain measures
time across longer periods like months or years.
4. The cells receive information about the time of
day or year from the animal's surroundings, and
then they send this information to the brain to
interpret.