Response to stress or danger that increases the heart rate and blood pressure, preparing the body to fight or flee: 2. The ‘feel-good’ hormones such as serotonin so you feel less pain:
3. Controls how much sugar is in the blood maintains balance to prevent diabetes:
4. What time you go to sleep and when you usually wake up in the morning:

What causes temperature extremes in the desert

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one

Describe characteristics of a good respitory surface