Answer:
If a group of living organisms is unable to adapt to changing conditions with the earth's system, it shall face extinction.
Explanation:
As time goes by, the earth's systems keep changing, either negatively or positively.
If the earth's temperature decreases then living organisms shall adapt to surviving in cold conditions, they shall for instance grow heavy fur cover on their skin to cover them from the cold.
Those that fail to adapt to the cold conditions shall face extinction by being overpowered by cold related complications.
After sensing a drop in calcium levels in the body,parathyroid hormone from the parathyroid glands will be secreted in a negative feedback mechanism of homeostasis
first the parathyroid hormone stimulates release of calcium ions from the bone through the process of bone reorption
then the parathyroid hormone will reduce urinary excretion of calcium by increasing its re absorption in the nephron
finally , the parathyroid hormone will increase the rate of vitamin d synthesis in the small intestine to yield more calcium
Answer:
DNA can be damaged via environmental factors as well. Environmental agents such as UV light, ionizing radiation, and genotoxic chemicals. Replication forks can be stalled due to damaged DNA and double strand breaks are also a form of DNA damage.