There Has Been a Marked Reduction in Air Pollution Since

question 191

Short Answer

There has been a marked reduction in air pollution since ________________.

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Definitions:

Motility

The ability of an organism or fluid to move spontaneously and actively, consuming energy in the process.

Chorionic Villi Sampling

A prenatal test that involves taking a sample of the chorionic villi from the placenta to test for chromosomal abnormalities in the fetus.

Pregnancy

The condition or period of being pregnant, where an embryo or fetus develops inside the uterus over about forty weeks from the last menstrual period.

Weeks

Units of time consisting of seven days, commonly used to measure and organize time in many cultures around the world.