Some air conditioners and heaters have a control system called a thermostat. A thermometer inside the thermostat continually
measures the temperature in the room. If the air temperature
in the room rises above a preset temperature, the thermostat
signals the air conditioner to turn on. If the air temperature in
the room falls below the preset temperature, the thermostat
signals the air conditioner to turn off.
ANALYZE Number these steps in order to illustrate the
feedback loop that occurs when the air temperature becomes
warmer than the thermostat setting (78 °F)
a. The thermostat senses the decrease in air temperature.
b. The air temperature reaches 78 °F.
c. The air conditioner turns off.
d. The thermostat senses the increase in air temperature.
e. The air temperature reaches 79 °F.
f. The air conditioner turns on.

Two male mice, which we will call male a and male b, are both phenotypically normal. male a was from a litter that contained half phenotypically normal mice and half dwarf mice. the mother of male a was known to be homozygous for the normal igf2 allele. male b was from a litter of eight mice that were all phenotypically normal. the parents of male b were a phenotypically normal male and a dwarf female. male a and male b were put into a cage with two female mice that we will call female a and female b. female a is a dwarf and female b is phenotypically normal. the parents of these two females were unknown, although it was known that they were from the same litter. the mice were allowed to mate with each other, and the following data were obtained: female a gave birth to three dwarf babies and four normal babies. female b gave birth to four normal babies and two dwarf babies. which male(s)mated with female a and female b? male a with both females male a with female b, and male b with female a male a with female a, and male b with female b could not be determined male b with both females

Which of these best describes wde by replicating the chromosomes c) the cytoplasm is divided between the two new daughter cells d) the nucleus opens to allow the chromosomes to enter the cytoplasm

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight