3 - Exposure to radiation
Radiation ionises cells and can cause mutations in genes.
The rest of the options have no affect on genetics at all, merely a temporary affect on the physical aspects of the body, such as heart rate etc.
Answer:
The semilunar valves prevent backflow of blood into the ventricles.
Explanation:
The semilunar valves are valves found at the junction between the left ventricle and the aorta and also between the right ventricle and the pulmonary artery. They are cup-like in shape and prevent blood from flowing back into the ventricles which are the pumping chambers.
There are two types of semilunar valves. The aortic semilunar valves and the pulmonary semilunar valves. They are made up of the endocardial and connective tissue.
The closure of the semilunar valves causes the second heart sound detected on the stethoscope.
Diseases that arise from the semilunar valves are caused by its stenosis which is the narrowing of the valves and regurgitation where the heart valves can no longer hold firm enough to prevent the backflow of blood.
Answer: E.) The high temperatures denature (destroy) most of the
fish's enzymes, but the bacteria have enzymes adapted to
these temperatures.
Answer:
Explanation:
Extreme temperature can damage the enzymes and they will no longer remain active. This can causes the denaturation of enzymes. Certain species of bacteria are thermophiles, that is bacterial species can live in the environment, which exhibit temperature higher than normal.
The fish enzymes may not be able to sustain in the high temperature and the fish will die but if the bacteria belong to the thermophile strain then the bacteria will hey adapted to the high temperatures of hot spring.
Explanation:
Answer:
species richness is the number of species in an ecosystem
Answer:
D
Explanation:
Because don't have any p53 genes
