The racial categories used by the U. S. Census Bureau like White, Black, American Indian, Hispanic, Asian and Pacific Islander are constructs not categories. Select one:

a.
linguistic; cultural

b.
biological; cultural

c.
little; biological

d.
social; biological

e.
personal; biological

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Which of the following is an abiotic factor in an ecosystem? a. bacteriab. airc. niched. grass(abiotic=non-living) me !