Which of the following is true about blood pressure?
a. it falls when the heart contracts.
b. artery walls to maintain pressure, even between heart beats.
c. it is not affected by atherosclerosis.
d. diastolic pressure is higher than systolic pressure.

d yoga because yoga makes your bones very strong

all soils contain mineral particles, organic matter, water and air the combinations determine the soil's properties – its texture, structure, porosity, chemistry and color. soil is made up of different-sized particles. sand particles tend to be the biggest.