Which of the following is true regarding brain development and aging?
a. blood flow is increased in the brain.
b. the brain uses more oxygen.
c. the brain becomes smaller and lighter.
d. the space between the brain and skull triples between 20 and 70 years of age.

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.