Answer:
c. In mines or confined places, where oxygen levels have been depleted, ventilation may occur.
Explanation:
Environments classified as “confined space” are hazardous for several reasons, but one of the main ones is the low oxygen concentration. Normally atmospheric air contains a 21% concentration of oxygen that is necessary for the maintenance of human life. Some confined spaces have this concentration of less than 21% oxygen, which can be very harmful to human life and lead to death.
Low oxygen concentration can be masked by ventilation in confined places. This is because in confined places oxygen levels may be low, but ventilation may continue despite inadequate oxygenation.
Answer:
The gene is the basic physical and functional unit of heredity. It consists of a specific sequence of nucleotides at a given position on a given chromosome that codes for a specific protein (or, in some cases, an RNA molecule).
It's supposed to be for number 5.
their cell wall surrounds it and secretes enzymes that encase it into a bubble and brings it into the cell. After other enzymes digest what is needed the process reverses and the bubble is 'spit' out or excreted.
"T1 - L2" <span>spinal nerves contribute to the sympathetic division of the ANS
Hope this helps!</span>