Sarah performs an experiment to determine the effects of nitrogen on plants she studies effects and nitrogen on the growth of the right hair height of the plant and nodule formation which factor is an independent variable

which

a. 35°c

b. 25°c

c. 10°c

d. 40°c

i took a test for bio that had this question and these were the correct answers, not sure if this is any now lol

the nervous system and the muscular system work together.  

sweat reaches the surface of the skin and evaporates into the air.

muscles underneath the skin relax, causing hair on the skin to lay flat.