The list that is composed of substances that are widely used for many years without apparent ill effects is the GRAS. GRAS is an abbreviation for generally recognized as safe; it is an American food and drug adminstration designation where chemical or substance added to food is considered safe by experts, and therefore, it is exempted from the usual federal food, drug, and cosmetic Act.
The answer to the question stated above is non-disjunction.
Geiger-Muller tube is instruments requires you test three times the background of the work area.
<u>Explanation</u>:
These detectors are gas filled detectors and hence requires time for responding to the value. This time is taken because during this period it collects the electric charges and features of the electric circuit. It also gets stabilized during this period. This device has thumb rule i.e one must wait or hold for at the least 3 times the time constant before getting the precise and accurate reading. The time constant order is 10 seconds for the ionization chamber but for the Geiger counter it can vary from seconds to greater than 20 seconds
The human consist of four types of tissues: epithelial, muscular, and nevous.
The cell in the picture have a simple columnar epithelium being part of the ciliated tissues. The structures in the picture can be identified as:
A- Cilia (microvilli) (motile structural elements of the epithelial)
B- Epithelial columnar cells (epithelium) (keratinized squamous cell)
C- Connective tissue
D- Basement membrane
E- Sensory receptor
