If the epiglottis fails to close correctly, a person may choke. The epiglottis is a leaf-shaped flap made of elastic cartilage that covers the opening of the larynx and prevents food or liquids from entering it.
Chocking may occur if the epiglottis fails to close, allowing food or liquids to enter the airway.
Estrogen is the hormone that is responsible for wider hips and other sexual characteristics. Although men also have some estrogen, this hormone is much higher in women .
The answer to your questions are
1. B
2. B
The answer is B. Every single amino acid has more than one codon.
There are 20 different amino acids, but there are more than 20 combinations of three nucleotide bases on DNA. There are 64 different combinations of three nucleotide bases on DNA, which is about 3 times more than the number of amino acids. Therefore, every single amino acid has more than one codon is the right answer. But, it should be taken into consideration, that 2 out of 20 different amino acids have only one codon - methionine and tryptophan.
B:Stones
B.Smog
C.Acid rain
D.Carbon dioxide
d. Carbon Dioxide
...............................................................................